diff --git a/application/controllers/ConfigController.php b/application/controllers/ConfigController.php
index a5fde03c..14bd7197 100644
--- a/application/controllers/ConfigController.php
+++ b/application/controllers/ConfigController.php
@@ -67,7 +67,7 @@ class ConfigController extends Controller
             }
 
             if ($form->save()) {
-                $this->translate('Command transport successfully created');
+                Notification::success($this->translate('Command transport successfully created'));
 
                 return true;
             }
diff --git a/application/controllers/ErrorController.php b/application/controllers/ErrorController.php
index c8602b61..e418b301 100644
--- a/application/controllers/ErrorController.php
+++ b/application/controllers/ErrorController.php
@@ -78,7 +78,8 @@ class ErrorController extends IcingaErrorController
             $this->setParam('error_handler', null);
         }
 
-        $heading = Html::tag('h2', 'Database not configured');
+        // TODO: Find a native way for ipl-html to support enriching text with html
+        $heading = Html::tag('h2', $this->translate('Database not configured'));
         $intro = Html::tag('p', ['data-base-target' => '_next'], Html::sprintf(
             'You seem to not have configured a resource for Icinga DB yet. Please %s and then tell Icinga DB Web %s.',
             new Link(
diff --git a/application/controllers/HealthController.php b/application/controllers/HealthController.php
index ae58f36f..b10ba522 100644
--- a/application/controllers/HealthController.php
+++ b/application/controllers/HealthController.php
@@ -35,11 +35,10 @@ class HealthController extends Controller
         $instance = $instance->first();
 
         if ($instance === null) {
-            $this->addContent(Html::tag(
-                'p',
+            $this->addContent(Html::tag('p', $this->translate(
                 'It seems that Icinga DB is not running.'
                 . ' Make sure Icinga DB is running and writing into the database.'
-            ));
+            )));
 
             return;
         }
@@ -52,27 +51,27 @@ class HealthController extends Controller
         $this->addContent(new Health($instance));
         $this->addContent(Html::tag('section', ['class' => 'check-summary'], [
                 Html::tag('div', ['class' => 'col'], [
-                    Html::tag('h3', 'Host Checks'),
+                    Html::tag('h3', $this->translate('Host Checks')),
                     Html::tag('div', ['class' => 'col-content'], [
                         new VerticalKeyValue(
-                            'Active',
+                            $this->translate('Active'),
                             $hoststateSummary->hosts_active_checks_enabled
                         ),
                         new VerticalKeyValue(
-                            'Passive',
+                            $this->translate('Passive'),
                             $hoststateSummary->hosts_passive_checks_enabled
                         )
                     ])
                 ]),
                 Html::tag('div', ['class' => 'col'], [
-                    Html::tag('h3', 'Service Checks'),
+                    Html::tag('h3', $this->translate('Service Checks')),
                     Html::tag('div', ['class' => 'col-content'], [
                         new VerticalKeyValue(
-                            'Active',
+                            $this->translate('Active'),
                             $servicestateSummary->services_active_checks_enabled
                         ),
                         new VerticalKeyValue(
-                            'Passive',
+                            $this->translate('Passive'),
                             $servicestateSummary->services_passive_checks_enabled
                         )
                     ])
@@ -82,7 +81,7 @@ class HealthController extends Controller
         $featureCommands = Html::tag(
             'section',
             ['class' => 'instance-commands'],
-            Html::tag('h2', 'Feature Commands')
+            Html::tag('h2', $this->translate('Feature Commands'))
         );
         $programStatus = (object) [
             'active_host_checks_enabled'    => $instance->icinga2_active_host_checks_enabled,
diff --git a/application/controllers/HistoryController.php b/application/controllers/HistoryController.php
index 97c57be8..70bdee4f 100644
--- a/application/controllers/HistoryController.php
+++ b/application/controllers/HistoryController.php
@@ -72,7 +72,7 @@ class HistoryController extends Controller
             $url->setParam('page', $page + 1)
                 ->setAnchor('page-' . ($page + 1))
         ))
-            ->setLabel('Load More')
+            ->setLabel($this->translate('Load More'))
             ->setAttribute('data-no-icinga-ajax', true);
 
         $this->addControl($sortControl);
diff --git a/application/controllers/HostController.php b/application/controllers/HostController.php
index 034a371c..6d2089a2 100644
--- a/application/controllers/HostController.php
+++ b/application/controllers/HostController.php
@@ -163,7 +163,7 @@ class HostController extends Controller
             $url->setParam('page', $page + 1)
                 ->setAnchor('page-' . ($page + 1))
         ))
-            ->setLabel('Load More')
+            ->setLabel($this->translate('Load More'))
             ->setAttribute('data-no-icinga-ajax', true);
 
         $this->addControl((new HostList([$this->host]))->setViewMode('minimal'));
diff --git a/application/controllers/ServiceController.php b/application/controllers/ServiceController.php
index fc4a59cc..a3241fd2 100644
--- a/application/controllers/ServiceController.php
+++ b/application/controllers/ServiceController.php
@@ -163,7 +163,7 @@ class ServiceController extends Controller
             $url->setParam('page', $page + 1)
                 ->setAnchor('page-' . ($page + 1))
         ))
-            ->setLabel('Load More')
+            ->setLabel($this->translate('Load More'))
             ->setAttribute('data-no-icinga-ajax', true);
 
         $this->addControl((new ServiceList([$this->service]))->setViewMode('minimal'));
diff --git a/application/controllers/StaticController.php b/application/controllers/StaticController.php
index 242bb6e4..c6aeb822 100644
--- a/application/controllers/StaticController.php
+++ b/application/controllers/StaticController.php
@@ -32,7 +32,7 @@ class StaticController extends Controller
         $filePath = realpath($moduleRoot . '/public/' . rawurldecode($file));
 
         if ($filePath === false) {
-            $this->httpNotFound('%s does not exist', $filePath);
+            $this->httpNotFound($this->translate('%s does not exist'), $filePath);
         }
 
         $s = stat($filePath);
diff --git a/application/controllers/UserController.php b/application/controllers/UserController.php
index 20592217..9354288f 100644
--- a/application/controllers/UserController.php
+++ b/application/controllers/UserController.php
@@ -19,7 +19,7 @@ class UserController extends Controller
     public function init()
     {
         if (! $this->hasPermission('*') && $this->hasPermission('no-monitoring/contacts')) {
-            throw new SecurityException('No permission for %s', 'monitoring/contacts');
+            throw new SecurityException($this->translate('No permission for %s'), 'monitoring/contacts');
         }
 
         $this->setTitle($this->translate('User'));
@@ -44,22 +44,22 @@ class UserController extends Controller
     {
         $this->addControl(new UserList([$this->user]));
 
-        $this->addContent(Html::tag('h2', 'Details'));
+        $this->addContent(Html::tag('h2', $this->translate('Details')));
         $this->addContent(Html::tag('ul', ['class' => 'key-value-list'], [
             Html::tag('li', [
-                Html::tag('span', ['class' => 'label'], 'E-Mail'),
+                Html::tag('span', ['class' => 'label'], $this->translate('E-Mail')),
                 Html::tag(
                     'span',
                     ['class' => 'value'],
-                    $this->user->email ?: Html::tag('span', ['class' => 'text-muted'], 'Unset')
+                    $this->user->email ?: Html::tag('span', ['class' => 'text-muted'], $this->translate('Unset'))
                 )
             ]),
             Html::tag('li', [
-                Html::tag('span', ['class' => 'label'], 'Pager'),
+                Html::tag('span', ['class' => 'label'], $this->translate('Pager')),
                 Html::tag(
                     'span',
                     ['class' => 'value'],
-                    $this->user->pager ?: Html::tag('span', ['class' => 'text-muted'], 'Unset')
+                    $this->user->pager ?: Html::tag('span', ['class' => 'text-muted'], $this->translate('Unset'))
                 )
             ])
         ]));
diff --git a/application/controllers/UsergroupController.php b/application/controllers/UsergroupController.php
index 8c40a4de..c6476384 100644
--- a/application/controllers/UsergroupController.php
+++ b/application/controllers/UsergroupController.php
@@ -19,7 +19,7 @@ class UsergroupController extends Controller
     public function init()
     {
         if (! $this->hasPermission('*') && $this->hasPermission('no-monitoring/contacts')) {
-            throw new SecurityException('No permission for %s', 'monitoring/contacts');
+            throw new SecurityException($this->translate('No permission for %s'), 'monitoring/contacts');
         }
 
         $this->setTitle($this->translate('User Group'));
diff --git a/application/controllers/UsergroupsController.php b/application/controllers/UsergroupsController.php
index 0fafd028..908059b6 100644
--- a/application/controllers/UsergroupsController.php
+++ b/application/controllers/UsergroupsController.php
@@ -16,7 +16,7 @@ class UsergroupsController extends Controller
         parent::init();
 
         if (! $this->hasPermission('*') && $this->hasPermission('no-monitoring/contacts')) {
-            throw new SecurityException('No permission for %s', 'monitoring/contacts');
+            throw new SecurityException($this->translate('No permission for %s'), 'monitoring/contacts');
         }
     }
 
diff --git a/application/controllers/UsersController.php b/application/controllers/UsersController.php
index a4a0ea00..5556ce15 100644
--- a/application/controllers/UsersController.php
+++ b/application/controllers/UsersController.php
@@ -16,7 +16,7 @@ class UsersController extends Controller
         parent::init();
 
         if (! $this->hasPermission('*') && $this->hasPermission('no-monitoring/contacts')) {
-            throw new SecurityException('No permission for %s', 'monitoring/contacts');
+            throw new SecurityException($this->translate('No permission for %s'), 'monitoring/contacts');
         }
     }
 
diff --git a/application/forms/DatabaseConfigForm.php b/application/forms/DatabaseConfigForm.php
index 7b26f818..deae2e49 100644
--- a/application/forms/DatabaseConfigForm.php
+++ b/application/forms/DatabaseConfigForm.php
@@ -22,7 +22,7 @@ class DatabaseConfigForm extends ConfigForm
             'description'   => $this->translate('Database resource'),
             'label'         => $this->translate('Database'),
             'multiOptions'  => array_merge(
-                ['' => ' - Please choose - '],
+                ['' => sprintf(' - %s - ', $this->translate('Please choose'))],
                 array_combine($dbResources, $dbResources)
             ),
             'disable'       => [''],
diff --git a/library/Icingadb/Common/HostStates.php b/library/Icingadb/Common/HostStates.php
index eb5a9aae..b74d17bd 100644
--- a/library/Icingadb/Common/HostStates.php
+++ b/library/Icingadb/Common/HostStates.php
@@ -95,19 +95,19 @@ class HostStates
     {
         switch (true) {
             case $state === self::UP:
-                $text = mt('icingadb', 'up');
+                $text = t('up');
                 break;
             case $state === self::DOWN:
-                $text = mt('icingadb', 'down');
+                $text = t('down');
                 break;
             case $state === self::UNREACHABLE:
-                $text = mt('icingadb', 'unreachable');
+                $text = t('unreachable');
                 break;
             case $state === self::PENDING:
-                $text = mt('icingadb', 'pending');
+                $text = t('pending');
                 break;
             case $state === null:
-                $text = mt('icingadb', 'not available');
+                $text = t('not available');
                 break;
             default:
                 throw new \InvalidArgumentException(sprintf('Invalid host state %d', $state));
diff --git a/library/Icingadb/Common/ServiceStates.php b/library/Icingadb/Common/ServiceStates.php
index c9220e4a..c815c1c0 100644
--- a/library/Icingadb/Common/ServiceStates.php
+++ b/library/Icingadb/Common/ServiceStates.php
@@ -103,22 +103,22 @@ class ServiceStates
     {
         switch (true) {
             case $state === self::OK:
-                $text = mt('icingadb', 'ok');
+                $text = t('ok');
                 break;
             case $state === self::WARNING:
-                $text = mt('icingadb', 'warning');
+                $text = t('warning');
                 break;
             case $state === self::CRITICAL:
-                $text = mt('icingadb', 'critical');
+                $text = t('critical');
                 break;
             case $state === self::UNKNOWN:
-                $text = mt('icingadb', 'unknown');
+                $text = t('unknown');
                 break;
             case $state === self::PENDING:
-                $text = mt('icingadb', 'pending');
+                $text = t('pending');
                 break;
             case $state === null:
-                $text = mt('icingadb', 'not available');
+                $text = t('not available');
                 break;
             default:
                 throw new \InvalidArgumentException(sprintf('Invalid service state %d', $state));
diff --git a/library/Icingadb/Compat/MonitoringRestrictions.php b/library/Icingadb/Compat/MonitoringRestrictions.php
index c98c3c95..6e6a62d0 100644
--- a/library/Icingadb/Compat/MonitoringRestrictions.php
+++ b/library/Icingadb/Compat/MonitoringRestrictions.php
@@ -54,10 +54,7 @@ class MonitoringRestrictions
                 $restriction->addFilter(Filter::fromQueryString($filter));
             } catch (QueryException $e) {
                 throw new ConfigurationError(
-                    mt(
-                        'monitoring',
-                        'Cannot apply restriction %s using the filter %s. You can only use the following columns: %s'
-                    ),
+                    t('Cannot apply restriction %s using the filter %s. You can only use the following columns: %s'),
                     $name,
                     $filter,
                     implode(', ', array(
diff --git a/library/Icingadb/Date/DateFormatter.php b/library/Icingadb/Date/DateFormatter.php
index 7687ee4c..f3ee9ac4 100644
--- a/library/Icingadb/Date/DateFormatter.php
+++ b/library/Icingadb/Date/DateFormatter.php
@@ -20,6 +20,7 @@ class DateFormatter
             $seconds = $seconds + (3600 - ($seconds % 3600));
         }
 
+        // TODO: tranlsation necessary?
         $minutes = floor((float) $seconds / 60);
         if ($minutes < 60) {
             $formatted = sprintf('%dm %ds', $minutes, $seconds % 60);
diff --git a/library/Icingadb/ProvidedHook/ApplicationState.php b/library/Icingadb/ProvidedHook/ApplicationState.php
index a65e34c6..d748afc0 100644
--- a/library/Icingadb/ProvidedHook/ApplicationState.php
+++ b/library/Icingadb/ProvidedHook/ApplicationState.php
@@ -39,8 +39,7 @@ class ApplicationState extends ApplicationStateHook
             $this->addError(
                 'icingadb/no-instance',
                 $noInstanceSince,
-                mt(
-                    'icingadb',
+                t(
                     'It seems that Icinga DB is not running.'
                     . ' Make sure Icinga DB is running and writing into the database.'
                 )
@@ -52,8 +51,7 @@ class ApplicationState extends ApplicationStateHook
                 $this->addError(
                     'icingadb/icingadb-down',
                     $instance->heartbeat,
-                    mt(
-                        'icingadb',
+                    t(
                         'It seems that Icinga DB is not running.'
                         . ' Make sure Icinga DB is running and writing into the database.'
                     )
@@ -92,10 +90,7 @@ class ApplicationState extends ApplicationStateHook
                     $this->addError(
                         'icingadb/redis-outdated',
                         $lastIcingaHeartbeat,
-                        mt(
-                            'icingadb',
-                            'Icinga Redis is outdated. Make sure Icinga 2 is running and connected to Redis.'
-                        )
+                        t('Icinga Redis is outdated. Make sure Icinga 2 is running and connected to Redis.')
                     );
 
                     break;
@@ -113,7 +108,7 @@ class ApplicationState extends ApplicationStateHook
             $this->addError(
                 'icingadb/redis-down',
                 $downSince,
-                mt('icingadb', sprintf("Can't connect to Icinga Redis: %s", $e->getMessage()))
+                sprintf(t("Can't connect to Icinga Redis: %s"), $e->getMessage())
             );
         }
     }
diff --git a/library/Icingadb/Widget/BaseItemList.php b/library/Icingadb/Widget/BaseItemList.php
index 1835ef84..86b9da1d 100644
--- a/library/Icingadb/Widget/BaseItemList.php
+++ b/library/Icingadb/Widget/BaseItemList.php
@@ -80,7 +80,7 @@ abstract class BaseItemList extends BaseHtmlElement
 
         if ($this->isEmpty()) {
             $this->setTag('div');
-            $this->add(new EmptyState('No items found.'));
+            $this->add(new EmptyState(t('No items found.')));
         }
     }
 }
diff --git a/library/Icingadb/Widget/BaseServiceListItem.php b/library/Icingadb/Widget/BaseServiceListItem.php
index 1f7878b7..323017c5 100644
--- a/library/Icingadb/Widget/BaseServiceListItem.php
+++ b/library/Icingadb/Widget/BaseServiceListItem.php
@@ -17,7 +17,8 @@ abstract class BaseServiceListItem extends StateListItem
 {
     protected function createSubject()
     {
-        return [
+        return [Html::sprintf(
+            t('%s on %s', '<service> on <host>'),
             Html::tag(
                 'a',
                 [
@@ -26,7 +27,6 @@ abstract class BaseServiceListItem extends StateListItem
                 ],
                 $this->item->display_name
             ),
-            ' on ',
             Html::tag(
                 'a',
                 [
@@ -39,7 +39,7 @@ abstract class BaseServiceListItem extends StateListItem
                     $this->item->host->display_name
                 ]
             )
-        ];
+        )];
     }
 
     protected function init()
diff --git a/library/Icingadb/Widget/ContinueWith.php b/library/Icingadb/Widget/ContinueWith.php
index b8b5b15c..439b1a43 100644
--- a/library/Icingadb/Widget/ContinueWith.php
+++ b/library/Icingadb/Widget/ContinueWith.php
@@ -29,7 +29,7 @@ class ContinueWith implements ValidHtml
         }
 
         $continue = new ActionLink(
-            'Continue with filter',
+            t('Continue with filter'),
             $this->url->setQueryString($this->filter->toQueryString()),
             'forward',
             ['class' => 'continue-with', 'data-base-target' => '_next']
diff --git a/library/Icingadb/Widget/Detail/CheckStatistics.php b/library/Icingadb/Widget/Detail/CheckStatistics.php
index 5c259b0e..f9ff2b62 100644
--- a/library/Icingadb/Widget/Detail/CheckStatistics.php
+++ b/library/Icingadb/Widget/Detail/CheckStatistics.php
@@ -69,7 +69,7 @@ class CheckStatistics extends Card
         $now = Html::tag('li', [
             'class' => 'bubble now',
             'style' => sprintf('left: %F%%', $hPadding + $leftNow),
-        ], Html::tag('strong', 'Now'));
+        ], Html::tag('strong', t('Now')));
         $above->add($now);
 
         $markerLast = Html::tag('div', [
@@ -99,9 +99,9 @@ class CheckStatistics extends Card
         $lastUpdate = Html::tag(
             'li',
             ['class' => 'bubble upwards last'],
-            new VerticalKeyValue('Last update', $this->object->state->last_update !== null
+            new VerticalKeyValue(t('Last update'), $this->object->state->last_update !== null
                 ? new TimeAgo($this->object->state->last_update)
-                : 'PENDING')
+                : t('PENDING'))
         );
         $interval = Html::tag(
             'li',
@@ -112,10 +112,10 @@ class CheckStatistics extends Card
             'li',
             ['class' => 'bubble upwards next'],
             $this->object->state->is_overdue
-                ? new VerticalKeyValue('Overdue', new TimeSince($nextCheckTime))
+                ? new VerticalKeyValue(t('Overdue'), new TimeSince($nextCheckTime))
                 : new VerticalKeyValue(
-                    'Next Check',
-                    $nextCheckTime !== null ? new TimeUntil($nextCheckTime) : 'PENDING'
+                    t('Next Check'),
+                    $nextCheckTime !== null ? new TimeUntil($nextCheckTime) : t('PENDING')
                 )
         );
 
@@ -152,14 +152,17 @@ class CheckStatistics extends Card
         ];
 
         $header->add([
-            new VerticalKeyValue('Command', $this->object->checkcommand),
+            new VerticalKeyValue(t('Command'), $this->object->checkcommand),
             new VerticalKeyValue(
-                'Attempts',
+                t('Attempts'),
                 new CheckAttempt($this->object->state->attempt, $this->object->max_check_attempts)
             ),
-            new VerticalKeyValue('Check source', $checkSource),
-            new VerticalKeyValue('Execution time', Format::seconds($this->object->state->execution_time)),
-            new VerticalKeyValue('Latency', Format::seconds($this->object->state->latency))
+            new VerticalKeyValue(t('Check source'), $checkSource),
+            new VerticalKeyValue(
+                t('Execution time'),
+                Format::seconds($this->object->state->execution_time)
+            ),
+            new VerticalKeyValue(t('Latency'), Format::seconds($this->object->state->latency))
         ]);
     }
 }
diff --git a/library/Icingadb/Widget/Detail/CommentDetail.php b/library/Icingadb/Widget/Detail/CommentDetail.php
index 2a82f019..66ab294a 100644
--- a/library/Icingadb/Widget/Detail/CommentDetail.php
+++ b/library/Icingadb/Widget/Detail/CommentDetail.php
@@ -38,7 +38,7 @@ class CommentDetail extends BaseHtmlElement
     protected function createComment()
     {
         return [
-            Html::tag('h2', 'Comment'),
+            Html::tag('h2', t('Comment')),
             new MarkdownText($this->comment->text)
         ];
     }
@@ -50,16 +50,19 @@ class CommentDetail extends BaseHtmlElement
         if ($this->comment->expire_time != 0) {
             $details[] = Html::tag(
                 'p',
-                ['This acknowledgement expires', ' ', new TimeUntil($this->comment->expire_time), '.']
+                Html::sprintf(
+                    t('This acknowledgement expires %s.', '..<time-until>'),
+                    new TimeUntil($this->comment->expire_time)
+                )
             );
         }
 
         if ($this->comment->is_sticky) {
-            $details[] = Html::tag('p', 'This acknowledgement is sticky.');
+            $details[] = Html::tag('p', t('This acknowledgement is sticky.'));
         }
 
         if (! empty($details)) {
-            array_unshift($details, Html::tag('h2', 'Details'));
+            array_unshift($details, Html::tag('h2', t('Details')));
         }
 
         return $details;
@@ -88,7 +91,7 @@ class CommentDetail extends BaseHtmlElement
 
         $submitButton = $removeCommentForm->getElement('btn_submit');
         $submitButton->content = (new HtmlDocument())
-            ->add([new Icon('trash'), 'Remove Comment'])
+            ->add([new Icon('trash'), t('Remove Comment')])
             ->setSeparator(' ')
             ->render();
 
diff --git a/library/Icingadb/Widget/Detail/CustomVarTable.php b/library/Icingadb/Widget/Detail/CustomVarTable.php
index 71ee1790..a01a6680 100644
--- a/library/Icingadb/Widget/Detail/CustomVarTable.php
+++ b/library/Icingadb/Widget/Detail/CustomVarTable.php
@@ -45,7 +45,8 @@ class CustomVarTable extends BaseHtmlElement
 
     protected function renderArray($name, array $array)
     {
-        $this->addRow("$name (Array)", count($array) . ' items');
+        $numItems = count($array);
+        $this->addRow("$name (Array)", sprintf(tp('%d item', '%d items', $numItems), $numItems));
 
         ++$this->level;
 
@@ -58,7 +59,8 @@ class CustomVarTable extends BaseHtmlElement
 
     protected function renderObject($name, $object)
     {
-        $this->addRow($name, count(get_object_vars($object)) . ' items');
+        $numItems = count(get_object_vars($object));
+        $this->addRow($name, sprintf(tp('%d item', '%d items', $numItems), $numItems));
 
         ++$this->level;
 
diff --git a/library/Icingadb/Widget/Detail/DowntimeCard.php b/library/Icingadb/Widget/Detail/DowntimeCard.php
index e6ff4c3b..bb86e5bd 100644
--- a/library/Icingadb/Widget/Detail/DowntimeCard.php
+++ b/library/Icingadb/Widget/Detail/DowntimeCard.php
@@ -119,7 +119,10 @@ class DowntimeCard extends BaseHtmlElement
                 Html::tag(
                     'li',
                     ['class' => 'bubble start'],
-                    new VerticalKeyValue('Scheduled Start', new TimeAgo($this->downtime->scheduled_start_time))
+                    new VerticalKeyValue(
+                        t('Scheduled Start'),
+                        new TimeAgo($this->downtime->scheduled_start_time)
+                    )
                 ),
                 Html::tag(
                     'li',
@@ -130,7 +133,7 @@ class DowntimeCard extends BaseHtmlElement
                             $hPadding + $this->calcRelativeLeft($this->downtime->scheduled_end_time)
                         )
                     ],
-                    new VerticalKeyValue('Scheduled End', $endTime)
+                    new VerticalKeyValue(t('Scheduled End'), $endTime)
                 )
             ]);
 
@@ -141,7 +144,7 @@ class DowntimeCard extends BaseHtmlElement
                         'class' => 'bubble upwards start' . ($evade ? ' left' : ''),
                         'style' => sprintf('left: %F%%', $flexStartLeft)
                     ],
-                    new VerticalKeyValue('Start', new TimeAgo($this->downtime->start_time))
+                    new VerticalKeyValue(t('Start'), new TimeAgo($this->downtime->start_time))
                 ),
                 Html::tag(
                     'li',
@@ -149,7 +152,7 @@ class DowntimeCard extends BaseHtmlElement
                         'class' => 'bubble upwards end' . ($evade ? ' right' : ''),
                         'style' => sprintf('left: %F%%', $flexEndLeft)
                     ],
-                    new VerticalKeyValue('End', new TimeUntil($this->downtime->end_time))
+                    new VerticalKeyValue(t('End'), new TimeUntil($this->downtime->end_time))
                 )
             ]);
         } elseif ($this->downtime->is_flexible) {
@@ -168,7 +171,10 @@ class DowntimeCard extends BaseHtmlElement
                 Html::tag(
                     'li',
                     ['class' => 'bubble start'],
-                    new VerticalKeyValue('Scheduled Start', new TimeAgo($this->downtime->scheduled_start_time))
+                    new VerticalKeyValue(
+                        t('Scheduled Start'),
+                        new TimeAgo($this->downtime->scheduled_start_time)
+                    )
                 ),
                 Html::tag(
                     'li',
@@ -179,7 +185,7 @@ class DowntimeCard extends BaseHtmlElement
                             $hPadding + $this->calcRelativeLeft($this->downtime->scheduled_end_time)
                         )
                     ],
-                    new VerticalKeyValue('Scheduled End', $endTime)
+                    new VerticalKeyValue(t('Scheduled End'), $endTime)
                 )
             ]);
 
@@ -204,7 +210,7 @@ class DowntimeCard extends BaseHtmlElement
                             $hPadding + $this->calcRelativeLeft($this->downtime->scheduled_start_time)
                         )
                     ],
-                    new VerticalKeyValue('Start', new TimeAgo($this->downtime->scheduled_start_time))
+                    new VerticalKeyValue(t('Start'), new TimeAgo($this->downtime->scheduled_start_time))
                 ),
                 Html::tag(
                     'li',
@@ -215,7 +221,7 @@ class DowntimeCard extends BaseHtmlElement
                             $hPadding + $this->calcRelativeLeft($this->downtime->scheduled_end_time)
                         )
                     ],
-                    new VerticalKeyValue('End', new TimeUntil($this->downtime->scheduled_end_time))
+                    new VerticalKeyValue(t('End'), new TimeUntil($this->downtime->scheduled_end_time))
                 )
             ]);
         }
@@ -229,7 +235,7 @@ class DowntimeCard extends BaseHtmlElement
                     $hPadding + $this->calcRelativeLeft(time(), null, null, -$hPadding + 3)
                 )
             ],
-            Html::tag('strong', 'Now')
+            Html::tag('strong', t('Now'))
         );
         $above->add($now);
 
diff --git a/library/Icingadb/Widget/Detail/DowntimeDetail.php b/library/Icingadb/Widget/Detail/DowntimeDetail.php
index 63e225b5..c150b1ff 100644
--- a/library/Icingadb/Widget/Detail/DowntimeDetail.php
+++ b/library/Icingadb/Widget/Detail/DowntimeDetail.php
@@ -93,7 +93,7 @@ class DowntimeDetail extends BaseHtmlElement
 
         $submitButton = $cancelDowntimeForm->getElement('btn_submit');
         $submitButton->content = (new HtmlDocument())
-            ->add([new Icon('trash'), 'Cancel Downtime'])
+            ->add([new Icon('trash'), t('Cancel Downtime')])
             ->setSeparator(' ')
             ->render();
 
@@ -107,47 +107,51 @@ class DowntimeDetail extends BaseHtmlElement
 
     protected function assemble()
     {
-        $this->add(Html::tag('h2', 'Comment'));
+        $this->add(Html::tag('h2', t('Comment')));
         $this->add(Html::tag('div', [
             new Icon('user'),
-            $this->downtime->author,
-            ' commented:',
-            new MarkdownText($this->downtime->comment)
+            Html::sprintf(
+                t('%s commented: %s', '<username> ..: <comment>'),
+                $this->downtime->author,
+                new MarkdownText($this->downtime->comment)
+            )
         ]));
 
-        $this->add(Html::tag('h2', 'Details'));
-        $this->add(
-            new HorizontalKeyValue('Created', WebDateFormatter::formatDateTime($this->downtime->entry_time))
-        );
-        $this->add(
-            new HorizontalKeyValue('Start time', WebDateFormatter::formatDateTime($this->downtime->start_time))
-        );
+        $this->add(Html::tag('h2', t('Details')));
         $this->add(new HorizontalKeyValue(
-            'End time',
+            t('Created'),
+            WebDateFormatter::formatDateTime($this->downtime->entry_time)
+        ));
+        $this->add(new HorizontalKeyValue(
+            t('Start time'),
+            WebDateFormatter::formatDateTime($this->downtime->start_time)
+        ));
+        $this->add(new HorizontalKeyValue(
+            t('End time'),
             WebDateFormatter::formatDateTime($this->downtime->end_time)
         ));
         $this->add(new HorizontalKeyValue(
-            'Scheduled Start',
+            t('Scheduled Start'),
             WebDateFormatter::formatDateTime($this->downtime->scheduled_start_time)
         ));
         $this->add(new HorizontalKeyValue(
-            'Scheduled End',
+            t('Scheduled End'),
             WebDateFormatter::formatDateTime($this->downtime->scheduled_end_time)
         ));
         $this->add(new HorizontalKeyValue(
-            'Scheduled Duration',
+            t('Scheduled Duration'),
             DateFormatter::formatDuration(
                 $this->downtime->scheduled_end_time - $this->downtime->scheduled_start_time
             )
         ));
         if ($this->downtime->is_flexible) {
             $this->add(new HorizontalKeyValue(
-                'Flexible Duration',
+                t('Flexible Duration'),
                 DateFormatter::formatDuration($this->downtime->flexible_duration)
             ));
         }
 
-        $this->add(Html::tag('h2', 'Progress'));
+        $this->add(Html::tag('h2', t('Progress')));
         $this->add($this->createTimeline());
 
         if ($this->getAuth()->hasPermission('monitoring/command/downtime/delete')) {
diff --git a/library/Icingadb/Widget/Detail/HostDetail.php b/library/Icingadb/Widget/Detail/HostDetail.php
index f6dba40d..b3ee01ba 100644
--- a/library/Icingadb/Widget/Detail/HostDetail.php
+++ b/library/Icingadb/Widget/Detail/HostDetail.php
@@ -26,11 +26,11 @@ class HostDetail extends ObjectDetail
             $services = new ServiceStatistics($this->serviceSummary);
             $services->setBaseFilter(Filter::where('host.name', $this->object->name));
         } else {
-            $services = new EmptyState(mt('icingadb', 'This host has no services'));
+            $services = new EmptyState(t('This host has no services'));
         }
 
-        $stats = [Html::tag('h2', mt('icingadb', 'Services'))];
-        $stats[] = new HorizontalKeyValue(mt('icingadb', 'Services'), $services);
+        $stats = [Html::tag('h2', t('Services'))];
+        $stats[] = new HorizontalKeyValue(t('Services'), $services);
         return $stats;
     }
 
diff --git a/library/Icingadb/Widget/Detail/HostStatistics.php b/library/Icingadb/Widget/Detail/HostStatistics.php
index a8756734..9c5c95ea 100644
--- a/library/Icingadb/Widget/Detail/HostStatistics.php
+++ b/library/Icingadb/Widget/Detail/HostStatistics.php
@@ -40,7 +40,7 @@ class HostStatistics extends ObjectStatistics
 
         return new Link(
             new VerticalKeyValue(
-                mtp('icingadb', 'Host', 'Hosts', $this->summary->hosts_total),
+                tp('Host', 'Hosts', $this->summary->hosts_total),
                 $this->summary->hosts_total
             ),
             $url
diff --git a/library/Icingadb/Widget/Detail/MultiselectQuickActions.php b/library/Icingadb/Widget/Detail/MultiselectQuickActions.php
index 52664090..3c65a993 100644
--- a/library/Icingadb/Widget/Detail/MultiselectQuickActions.php
+++ b/library/Icingadb/Widget/Detail/MultiselectQuickActions.php
@@ -44,9 +44,9 @@ class MultiselectQuickActions extends BaseHtmlElement
         ) {
             $this->assembleAction(
                 'acknowledge',
-                'Acknowledge',
+                t('Acknowledge'),
                 'icon-edit',
-                'Acknowledge this problem, suppress all future notifications for it and tag it as being handled'
+                t('Acknowledge this problem, suppress all future notifications for it and tag it as being handled')
             );
         }
 
@@ -78,27 +78,27 @@ class MultiselectQuickActions extends BaseHtmlElement
         if ($this->getAuth()->hasPermission('monitoring/command/comment/add')) {
             $this->assembleAction(
                 'addComment',
-                'Comment',
+                t('Comment'),
                 'icon-comment-empty',
-                'Add a new comment'
+                t('Add a new comment')
             );
         }
 
         if ($this->getAuth()->hasPermission('monitoring/command/send-custom-notification')) {
             $this->assembleAction(
                 'sendCustomNotification',
-                'Notification',
+                t('Notification'),
                 'icon-bell',
-                'Send a custom notification'
+                t('Send a custom notification')
             );
         }
 
         if ($this->getAuth()->hasPermission('monitoring/command/downtime/schedule')) {
             $this->assembleAction(
                 'scheduleDowntime',
-                'Downtime',
+                t('Downtime'),
                 'icon-plug',
-                'Schedule a downtime to suppress all problem notifications within a specific period of time'
+                t('Schedule a downtime to suppress all problem notifications within a specific period of time')
             );
         }
 
@@ -111,18 +111,18 @@ class MultiselectQuickActions extends BaseHtmlElement
         ) {
             $this->assembleAction(
                 'scheduleCheck',
-                'Reschedule',
+                t('Reschedule'),
                 'icon-calendar-empty',
-                'Schedule the next active check at a different time than the current one'
+                t('Schedule the next active check at a different time than the current one')
             );
         }
 
         if ($this->getAuth()->hasPermission('monitoring/command/process-check-result')) {
             $this->assembleAction(
                 'processCheckresult',
-                'Process check result',
+                t('Process check result'),
                 'icon-edit',
-                'Submit passive check result'
+                t('Submit passive check result')
             );
         }
     }
diff --git a/library/Icingadb/Widget/Detail/ObjectDetail.php b/library/Icingadb/Widget/Detail/ObjectDetail.php
index 6bf5916a..855ce354 100644
--- a/library/Icingadb/Widget/Detail/ObjectDetail.php
+++ b/library/Icingadb/Widget/Detail/ObjectDetail.php
@@ -68,7 +68,7 @@ class ObjectDetail extends BaseHtmlElement
 
         foreach ($this->compatObject->getActionUrls() as $i => $url) {
             $navigation->addItem(
-                'Action ' . ($i + 1),
+                sprintf(t('Action %d'), $i + 1),
                 [
                     'renderer' => [
                         'NavigationItemRenderer',
@@ -90,7 +90,7 @@ class ObjectDetail extends BaseHtmlElement
         }
 
         return [
-            Html::tag('h2', 'Actions'),
+            Html::tag('h2', t('Actions')),
             new HtmlString($navigation->getRenderer()->setCssClass('actions')->render())
         ];
     }
@@ -98,7 +98,7 @@ class ObjectDetail extends BaseHtmlElement
     protected function createCheckStatistics()
     {
         return [
-            Html::tag('h2', 'Check Statistics'),
+            Html::tag('h2', t('Check Statistics')),
             new CheckStatistics($this->object)
         ];
     }
@@ -116,13 +116,13 @@ class ObjectDetail extends BaseHtmlElement
         /** @var ResultSet $comments */
         $comments = $this->object->comment->with($relations)->limit(3)->peekAhead()->execute();
 
-        $content = [Html::tag('h2', 'Comments')];
+        $content = [Html::tag('h2', t('Comments'))];
 
         if ($comments->hasResult()) {
             $content[] = new CommentList($comments);
             $content[] = new ShowMore($comments, $link);
         } else {
-            $content[] = new EmptyState('No comments created.');
+            $content[] = new EmptyState(t('No comments created.'));
         }
 
         return $content;
@@ -130,7 +130,7 @@ class ObjectDetail extends BaseHtmlElement
 
     protected function createCustomVars()
     {
-        $content = [Html::tag('h2', 'Custom Variables')];
+        $content = [Html::tag('h2', t('Custom Variables'))];
         $vars = $this->object->customvar->execute();
 
         if ($vars->hasResult()) {
@@ -143,7 +143,7 @@ class ObjectDetail extends BaseHtmlElement
 
             $content[] = new CustomVarTable($vars);
         } else {
-            $content[] = new EmptyState('No custom variables configured.');
+            $content[] = new EmptyState(t('No custom variables configured.'));
         }
 
         return $content;
@@ -159,13 +159,13 @@ class ObjectDetail extends BaseHtmlElement
 
         $downtimes = $this->object->downtime->limit(3)->peekAhead()->execute();
 
-        $content = [Html::tag('h2', 'Downtimes')];
+        $content = [Html::tag('h2', t('Downtimes'))];
 
         if ($downtimes->hasResult()) {
             $content[] = new DowntimeList($downtimes);
             $content[] = new ShowMore($downtimes, $link);
         } else {
-            $content[] = new EmptyState('No downtimes scheduled.');
+            $content[] = new EmptyState(t('No downtimes scheduled.'));
         }
 
         return $content;
@@ -177,7 +177,7 @@ class ObjectDetail extends BaseHtmlElement
 
     protected function createGroups()
     {
-        $groups = [Html::tag('h2', 'Groups')];
+        $groups = [Html::tag('h2', t('Groups'))];
 
         if ($this->objectType === 'host') {
             $hostgroupList = new TagList();
@@ -187,10 +187,10 @@ class ObjectDetail extends BaseHtmlElement
             }
 
             $groups[] = new HorizontalKeyValue(
-                'Host Groups',
+                t('Host Groups'),
                 $hostgroupList->hasContent()
                     ? $hostgroupList
-                    : new EmptyState('Not a member of any host group.')
+                    : new EmptyState(t('Not a member of any host group.'))
             );
         } else {
             $servicegroupList = new TagList();
@@ -200,10 +200,10 @@ class ObjectDetail extends BaseHtmlElement
             }
 
             $groups[] = new HorizontalKeyValue(
-                'Service Groups',
+                t('Service Groups'),
                 $servicegroupList->hasContent()
                     ? $servicegroupList
-                    : new EmptyState('Not a member of any service group.')
+                    : new EmptyState(t('Not a member of any service group.'))
             );
         }
 
@@ -217,7 +217,7 @@ class ObjectDetail extends BaseHtmlElement
 
         foreach ($this->compatObject->getNotesUrls() as $i => $url) {
             $navigation->addItem(
-                'Notes ' . ($i + 1),
+                sprintf(t('Note %d'), $i + 1),
                 [
                     'renderer' => 'NavigationItemRenderer',
                     'target'   => '_blank',
@@ -245,7 +245,7 @@ class ObjectDetail extends BaseHtmlElement
             return null;
         }
 
-        array_unshift($content, Html::tag('h2', 'Notes'));
+        array_unshift($content, Html::tag('h2', t('Notes')));
 
         return $content;
     }
@@ -269,14 +269,16 @@ class ObjectDetail extends BaseHtmlElement
         }
 
         return [
-            Html::tag('h2', 'Notifications'),
+            Html::tag('h2', t('Notifications')),
             new HorizontalKeyValue(
-                'Users',
-                $userList->hasContent() ? $userList : new EmptyState('No users configured.')
+                t('Users'),
+                $userList->hasContent() ? $userList : new EmptyState(t('No users configured.'))
             ),
             new HorizontalKeyValue(
-                'User Groups',
-                $usergroupList->hasContent() ? $usergroupList : new EmptyState('No user groups configured.')
+                t('User Groups'),
+                $usergroupList->hasContent()
+                    ? $usergroupList
+                    : new EmptyState(t('No user groups configured.'))
             )
         ];
     }
@@ -289,10 +291,10 @@ class ObjectDetail extends BaseHtmlElement
         $helper = new Zend_View_Helper_Perfdata();
         $helper->view = Icinga::app()->getViewRenderer()->view;
 
-        $content[] = Html::tag('h2', 'Performance Data');
+        $content[] = Html::tag('h2', t('Performance Data'));
 
         if (empty($this->object->state->performance_data)) {
-            $content[] = new EmptyState('No performance data available.');
+            $content[] = new EmptyState(t('No performance data available.'));
         } else {
             $content[] = new HtmlString($helper->perfdata($this->object->state->performance_data));
         }
@@ -303,7 +305,7 @@ class ObjectDetail extends BaseHtmlElement
     protected function createPluginOutput()
     {
         return [
-            Html::tag('h2', 'Plugin Output'),
+            Html::tag('h2', t('Plugin Output')),
             Html::tag(
                 'div',
                 ['class' => 'collapsible'],
@@ -329,7 +331,7 @@ class ObjectDetail extends BaseHtmlElement
         }
 
         return [
-            Html::tag('h2', 'Feature Commands'),
+            Html::tag('h2', t('Feature Commands')),
             HtmlString::create($form->render())
         ];
     }
diff --git a/library/Icingadb/Widget/Detail/ObjectsDetail.php b/library/Icingadb/Widget/Detail/ObjectsDetail.php
index ca154e1f..f9c10f00 100644
--- a/library/Icingadb/Widget/Detail/ObjectsDetail.php
+++ b/library/Icingadb/Widget/Detail/ObjectsDetail.php
@@ -53,7 +53,10 @@ class ObjectsDetail extends BaseHtmlElement
 
             $content->add([
                 HtmlString::create($hostsChart->render()),
-                new VerticalKeyValue('Hosts', $this->summary->hosts_total),
+                new VerticalKeyValue(
+                    tp('Host', 'Hosts', $this->summary->hosts_total),
+                    $this->summary->hosts_total
+                ),
                 new HostStateBadges($badges)
             ]);
         } else {
@@ -72,7 +75,10 @@ class ObjectsDetail extends BaseHtmlElement
 
             $content->add([
                 HtmlString::create($servicesChart->render()),
-                new VerticalKeyValue('Services', $this->summary->services_total),
+                new VerticalKeyValue(
+                    tp('Service', 'Services', $this->summary->services_total),
+                    $this->summary->services_total
+                ),
                 $badges
             ]);
         }
@@ -82,15 +88,18 @@ class ObjectsDetail extends BaseHtmlElement
 
     protected function createComments()
     {
-        $content = [Html::tag('h2', 'Comments')];
+        $content = [Html::tag('h2', t('Comments'))];
 
         if ($this->summary->comments_total > 0) {
             $content[] = new ActionLink(
-                sprintf('Show %d comments', $this->summary->comments_total),
+                sprintf(
+                    tp('Show %d comment', 'Show %d comments', $this->summary->comments_total),
+                    $this->summary->comments_total
+                ),
                 Links::comments()->setQueryString($this->getBaseFilter()->toQueryString())
             );
         } else {
-            $content[] = new EmptyState('No comments created.');
+            $content[] = new EmptyState(t('No comments created.'));
         }
 
         return $content;
@@ -98,15 +107,18 @@ class ObjectsDetail extends BaseHtmlElement
 
     protected function createDowntimes()
     {
-        $content = [Html::tag('h2', 'Downtimes')];
+        $content = [Html::tag('h2', t('Downtimes'))];
 
         if ($this->summary->downtimes_total > 0) {
             $content[] = new ActionLink(
-                sprintf('Show %d downtimes', $this->summary->downtimes_total),
+                sprintf(
+                    tp('Show %d downtime', 'Show %d downtimes', $this->summary->downtimes_total),
+                    $this->summary->downtimes_total
+                ),
                 Links::downtimes()->setQueryString($this->getBaseFilter()->toQueryString())
             );
         } else {
-            $content[] = new EmptyState('No downtimes scheduled.');
+            $content[] = new EmptyState(t('No downtimes scheduled.'));
         }
 
         return $content;
@@ -127,7 +139,7 @@ class ObjectsDetail extends BaseHtmlElement
         }
 
         return [
-            Html::tag('h2', 'Feature Commands'),
+            Html::tag('h2', t('Feature Commands')),
             HtmlString::create($form->render())
         ];
     }
@@ -135,7 +147,7 @@ class ObjectsDetail extends BaseHtmlElement
     protected function createSummary()
     {
         return [
-            Html::tag('h2', 'Summary'),
+            Html::tag('h2', t('Summary')),
             $this->createChart()
         ];
     }
diff --git a/library/Icingadb/Widget/Detail/QuickActions.php b/library/Icingadb/Widget/Detail/QuickActions.php
index 92c1b5ef..b951f0f8 100644
--- a/library/Icingadb/Widget/Detail/QuickActions.php
+++ b/library/Icingadb/Widget/Detail/QuickActions.php
@@ -46,9 +46,9 @@ class QuickActions extends BaseHtmlElement
             } elseif ($this->getAuth()->hasPermission('monitoring/command/acknowledge-problem')) {
                 $this->assembleAction(
                     'acknowledge',
-                    'Acknowledge',
+                    t('Acknowledge'),
                     'icon-edit',
-                    'Acknowledge this problem, suppress all future notifications for it and tag it as being handled'
+                    t('Acknowledge this problem, suppress all future notifications for it and tag it as being handled')
                 );
             }
         }
@@ -69,27 +69,27 @@ class QuickActions extends BaseHtmlElement
         if ($this->getAuth()->hasPermission('monitoring/command/comment/add')) {
             $this->assembleAction(
                 'addComment',
-                'Comment',
+                t('Comment', 'verb'),
                 'icon-comment-empty',
-                'Add a new comment'
+                t('Add a new comment')
             );
         }
 
         if ($this->getAuth()->hasPermission('monitoring/command/send-custom-notification')) {
             $this->assembleAction(
                 'sendCustomNotification',
-                'Notification',
+                t('Notification'),
                 'icon-bell',
-                'Send a custom notification'
+                t('Send a custom notification')
             );
         }
 
         if ($this->getAuth()->hasPermission('monitoring/command/downtime/schedule')) {
             $this->assembleAction(
                 'scheduleDowntime',
-                'Downtime',
+                t('Downtime'),
                 'icon-plug',
-                'Schedule a downtime to suppress all problem notifications within a specific period of time'
+                t('Schedule a downtime to suppress all problem notifications within a specific period of time')
             );
         }
 
@@ -102,18 +102,21 @@ class QuickActions extends BaseHtmlElement
         ) {
             $this->assembleAction(
                 'scheduleCheck',
-                'Reschedule',
+                t('Reschedule'),
                 'icon-calendar-empty',
-                'Schedule the next active check at a different time than the current one'
+                t('Schedule the next active check at a different time than the current one')
             );
         }
 
         if ($this->getAuth()->hasPermission('monitoring/command/process-check-result')) {
             $this->assembleAction(
                 'processCheckresult',
-                'Process check result',
+                t('Process check result'),
                 'icon-edit',
-                sprintf('Submit a one time or so called passive result for the %s check', $this->object->checkcommand)
+                sprintf(
+                    t('Submit a one time or so called passive result for the %s check'),
+                    $this->object->checkcommand
+                )
             );
         }
     }
diff --git a/library/Icingadb/Widget/Detail/ServiceStatistics.php b/library/Icingadb/Widget/Detail/ServiceStatistics.php
index b81cbc11..a60b966b 100644
--- a/library/Icingadb/Widget/Detail/ServiceStatistics.php
+++ b/library/Icingadb/Widget/Detail/ServiceStatistics.php
@@ -44,7 +44,7 @@ class ServiceStatistics extends ObjectStatistics
 
         return new Link(
             new VerticalKeyValue(
-                mtp('icingadb', 'Service', 'Services', $this->summary->services_total),
+                tp('Service', 'Services', $this->summary->services_total),
                 $this->summary->services_total
             ),
             $url
diff --git a/library/Icingadb/Widget/Health.php b/library/Icingadb/Widget/Health.php
index f7fd4484..a88c4daf 100644
--- a/library/Icingadb/Widget/Health.php
+++ b/library/Icingadb/Widget/Health.php
@@ -22,34 +22,40 @@ class Health extends BaseHtmlElement
     {
         if ($this->data->heartbeat > time() - 60) {
             $this->add(Html::tag('div', ['class' => 'icinga-health up'], [
-                'Icinga 2 is up and running ', new TimeSince($this->data->icinga2_start_time)
+                Html::sprintf(
+                    t('Icinga 2 is up and running %s', '...since <timespan>'),
+                    new TimeSince($this->data->icinga2_start_time)
+                )
             ]));
         } else {
             $this->add(Html::tag('div', ['class' => 'icinga-health down'], [
-                'Icinga 2 or Icinga DB is not running ', new TimeSince($this->data->heartbeat)
+                Html::sprintf(
+                    t('Icinga 2 or Icinga DB is not running %s', '...since <timespan>'),
+                    new TimeSince($this->data->heartbeat)
+                )
             ]));
         }
 
         $icingaInfo = Html::tag('div', ['class' => 'icinga-info'], [
             new VerticalKeyValue(
-                'Icinga 2 Version',
+                t('Icinga 2 Version'),
                 $this->data->icinga2_version
             ),
             new VerticalKeyValue(
-                'Icinga 2 Start Time',
+                t('Icinga 2 Start Time'),
                 new TimeAgo($this->data->icinga2_start_time)
             ),
             new VerticalKeyValue(
-                'Last Heartbeat',
+                t('Last Heartbeat'),
                 new TimeAgo($this->data->heartbeat)
             ),
             new VerticalKeyValue(
-                'Active Icinga 2 Endpoint',
-                $this->data->endpoint->name ?: 'N/A'
+                t('Active Icinga 2 Endpoint'),
+                $this->data->endpoint->name ?: t('N/A')
             ),
             new VerticalKeyValue(
-                'Active Icinga Web Endpoint',
-                gethostname() ?: 'N/A'
+                t('Active Icinga Web Endpoint'),
+                gethostname() ?: t('N/A')
             )
         ]);
         $this->add($icingaInfo);
diff --git a/library/Icingadb/Widget/HostStatusBar.php b/library/Icingadb/Widget/HostStatusBar.php
index 203ef929..7690ee02 100644
--- a/library/Icingadb/Widget/HostStatusBar.php
+++ b/library/Icingadb/Widget/HostStatusBar.php
@@ -11,7 +11,7 @@ class HostStatusBar extends BaseStatusBar
 {
     protected function assembleTotal(BaseHtmlElement $total)
     {
-        $total->add(sprintf('%d Hosts', $this->summary->hosts_total));
+        $total->add(sprintf(tp('%d Host', '%d Hosts', $this->summary->hosts_total), $this->summary->hosts_total));
     }
 
     protected function createStateBadges()
diff --git a/library/Icingadb/Widget/HostSummaryDonut.php b/library/Icingadb/Widget/HostSummaryDonut.php
index 0fc9c1a1..69e0450d 100644
--- a/library/Icingadb/Widget/HostSummaryDonut.php
+++ b/library/Icingadb/Widget/HostSummaryDonut.php
@@ -42,7 +42,7 @@ class HostSummaryDonut extends Card
                 'sort' => 'host.state.last_state_change'
             ]))
             ->setLabelBigEyeCatching($this->summary->hosts_down_unhandled > 0)
-            ->setLabelSmall(mt('icingadb', 'Hosts Down'));
+            ->setLabelSmall(tp('Host Down', 'Hosts Down', $this->summary->hosts_down_unhandled));
 
         $body->add(new HtmlElement('div', ['class' => 'donut'], new HtmlString($donut->render())));
     }
@@ -54,6 +54,6 @@ class HostSummaryDonut extends Card
 
     protected function assembleHeader(BaseHtmlElement $header)
     {
-        $header->add(new HtmlElement('h2', null, mt('icingadb', 'Host Summary')));
+        $header->add(new HtmlElement('h2', null, t('Host Summary')));
     }
 }
diff --git a/library/Icingadb/Widget/ItemList/BaseCommentListItem.php b/library/Icingadb/Widget/ItemList/BaseCommentListItem.php
index 823624f1..c74065fb 100644
--- a/library/Icingadb/Widget/ItemList/BaseCommentListItem.php
+++ b/library/Icingadb/Widget/ItemList/BaseCommentListItem.php
@@ -36,11 +36,10 @@ abstract class BaseCommentListItem extends BaseListItem
         $header->add([
             new Icon(Icons::USER),
             new Link(
-                [
-                    $this->item->author,
-                    ' ',
-                    ($isAck ? 'acknowledged' : 'commented')
-                ],
+                sprintf(
+                    $isAck ? t('%s acknowledged', '<username>..') : t('%s commented', '<username>..'),
+                    $this->item->author
+                ),
                 Links::comment($this->item)
             )
         ]);
@@ -56,7 +55,7 @@ abstract class BaseCommentListItem extends BaseListItem
         }
 
         if ($expires != 0) {
-            $header->add(HTML::tag('span', ['class' => 'ack-badge badge'], 'EXPIRES'));
+            $header->add(HTML::tag('span', ['class' => 'ack-badge badge'], t('EXPIRES')));
         }
 
         $header->add(Html::tag('br'));
diff --git a/library/Icingadb/Widget/ItemList/BaseDowntimeListItem.php b/library/Icingadb/Widget/ItemList/BaseDowntimeListItem.php
index 1a28a8d7..85e9da70 100644
--- a/library/Icingadb/Widget/ItemList/BaseDowntimeListItem.php
+++ b/library/Icingadb/Widget/ItemList/BaseDowntimeListItem.php
@@ -102,12 +102,6 @@ abstract class BaseDowntimeListItem extends BaseListItem
 
     protected function assembleTitle(BaseHtmlElement $title)
     {
-        if ($this->item->is_flexible) {
-            $type = 'Flexible';
-        } else {
-            $type = 'Fixed';
-        }
-
         if ($this->item->object_type === 'host') {
             $link = $this->createHostLink($this->item->host, true);
         } else {
@@ -115,7 +109,12 @@ abstract class BaseDowntimeListItem extends BaseListItem
         }
 
         $title->add([
-            new Link("{$type} Downtime", Links::downtime($this->item)),
+            new Link(
+                $this->item->is_flexible
+                    ? t('Flexible Downtime')
+                    : t('Fixed Downtime'),
+                Links::downtime($this->item)
+            ),
             ': ',
             $link
         ]);
@@ -129,7 +128,9 @@ abstract class BaseDowntimeListItem extends BaseListItem
             if ($this->item->is_in_effect) {
                 $visual->addAttributes(['class' => 'active']);
             }
-            $visual->add([
+
+            $visual->add(Html::sprintf(
+                t('%s left', '<timespan>..'),
                 Html::tag(
                     'strong',
                     Html::tag(
@@ -140,10 +141,8 @@ abstract class BaseDowntimeListItem extends BaseListItem
                         ],
                         DateFormatter::formatDuration($this->duration, true)
                     )
-                ),
-                ' ',
-                'left'
-            ]);
+                )
+            ));
         } else {
             $visual->add([
                 'in',
diff --git a/library/Icingadb/Widget/ItemList/HistoryListItem.php b/library/Icingadb/Widget/ItemList/HistoryListItem.php
index b74f97b9..8e902b4a 100644
--- a/library/Icingadb/Widget/ItemList/HistoryListItem.php
+++ b/library/Icingadb/Widget/ItemList/HistoryListItem.php
@@ -51,23 +51,25 @@ class HistoryListItem extends CommonListItem
                 break;
             case 'flapping_start':
                 $caption
-                    ->add(
-                        'State Change Rate: ' . $this->item->flapping->percent_state_change_start
-                        . '%; Start Threshold: ' . $this->item->host->flapping_threshold_high . '%'
-                    )
+                    ->add(sprintf(
+                        t('State Change Rate: %.2f%%; Start Threshold: %.2f%%'),
+                        $this->item->flapping->percent_state_change_start,
+                        $this->item->host->flapping_threshold_high
+                    ))
                     ->getAttributes()
                     ->add('class', 'plugin-output');
 
                 break;
             case 'flapping_end':
                 $caption
-                    ->add(
-                        'State Change Rate: ' . $this->item->host->flapping_threshold_low
-                        . '%; End Threshold: ' . $this->item->host->flapping_threshold_high
-                        . '%; Flapping for ' . DateFormatter::formatDuration(
+                    ->add(sprintf(
+                        t('State Change Rate: %.2f%%; End Threshold: %.2f%%; Flapping for %s'),
+                        $this->item->host->flapping_threshold_low,
+                        $this->item->host->flapping_threshold_high,
+                        DateFormatter::formatDuration(
                             $this->item->flapping->end_time - $this->item->flapping->start_time
                         )
-                    )
+                    ))
                     ->getAttributes()
                     ->add('class', 'plugin-output');
 
@@ -76,8 +78,10 @@ class HistoryListItem extends CommonListItem
                 if (! empty($this->item->acknowledgement->cleared_by)) {
                     $caption->add([
                         new Icon(Icons::USER),
-                        'Cleared by: ',
-                        $this->item->acknowledgement->cleared_by
+                        sprintf(
+                            t('Cleared by: %s', '..<username>'),
+                            $this->item->acknowledgement->cleared_by
+                        )
                     ]);
 
                     break;
@@ -184,40 +188,40 @@ class HistoryListItem extends CommonListItem
     {
         switch ($this->item->event_type) {
             case 'comment_add':
-                $title->add('Comment added');
+                $title->add(t('Comment added'));
 
                 break;
             case 'comment_remove':
-                $title->add('Comment removed');
+                $title->add(t('Comment removed'));
 
                 break;
             case 'downtime_end':
-                $title->add('Downtime ended');
+                $title->add(t('Downtime ended'));
 
                 break;
             case 'downtime_start':
-                $title->add('Downtime started');
+                $title->add(t('Downtime started'));
 
                 break;
             case 'flapping_start':
-                $title->add('Flapping started');
+                $title->add(t('Flapping started'));
 
                 break;
             case 'flapping_end':
-                $title->add('Flapping ended');
+                $title->add(t('Flapping ended'));
 
                 break;
             case 'ack_set':
-                $title->add('Acknowledgement set');
+                $title->add(t('Acknowledgement set'));
 
                 break;
             case 'ack_clear':
-                $title->add('Acknowledgement cleared');
+                $title->add(t('Acknowledgement cleared'));
 
                 break;
             case 'notification':
                 $title->add([
-                    'Notification',
+                    t('Notification'),
                     ': ',
                     sprintf(
                         NotificationListItem::PHRASES[$this->item->notification->type],
@@ -227,7 +231,11 @@ class HistoryListItem extends CommonListItem
 
                 break;
             case 'state_change':
-                $title->add(sprintf('%s state changed', ucfirst($this->item->state->state_type)));
+                if ($this->item->state->state_type === 'hard') {
+                    $title->add(t('Hard state changed'));
+                } else {
+                    $title->add(t('Soft state changed'));
+                }
 
                 break;
             default:
diff --git a/library/Icingadb/Widget/ItemList/PageSeparatorItem.php b/library/Icingadb/Widget/ItemList/PageSeparatorItem.php
index 2e755dea..79c88d99 100644
--- a/library/Icingadb/Widget/ItemList/PageSeparatorItem.php
+++ b/library/Icingadb/Widget/ItemList/PageSeparatorItem.php
@@ -29,7 +29,7 @@ class PageSeparatorItem extends BaseHtmlElement
             [
                 'id' => 'page-' . $this->pageNumber
             ],
-            'Page ' . $this->pageNumber
+            sprintf(t('Page %d'), $this->pageNumber)
         ));
     }
 }
diff --git a/library/Icingadb/Widget/ServiceStatusBar.php b/library/Icingadb/Widget/ServiceStatusBar.php
index cd2f2035..e3411064 100644
--- a/library/Icingadb/Widget/ServiceStatusBar.php
+++ b/library/Icingadb/Widget/ServiceStatusBar.php
@@ -11,7 +11,10 @@ class ServiceStatusBar extends BaseStatusBar
 {
     protected function assembleTotal(BaseHtmlElement $total)
     {
-        $total->add(sprintf('%d Services', $this->summary->services_total));
+        $total->add(sprintf(
+            tp('%d Service', '%d Services', $this->summary->services_total),
+            $this->summary->services_total
+        ));
     }
 
     protected function createStateBadges()
diff --git a/library/Icingadb/Widget/ServiceSummaryDonut.php b/library/Icingadb/Widget/ServiceSummaryDonut.php
index d82462b5..f5875bde 100644
--- a/library/Icingadb/Widget/ServiceSummaryDonut.php
+++ b/library/Icingadb/Widget/ServiceSummaryDonut.php
@@ -44,7 +44,9 @@ class ServiceSummaryDonut extends Card
                 'sort' => 'service.state.last_state_change'
             ]))
             ->setLabelBigEyeCatching($this->summary->services_critical_unhandled > 0)
-            ->setLabelSmall(mt('icingadb', 'Services Critical'));
+            ->setLabelSmall(
+                tp('Service Critical', 'Services Critical', $this->summary->services_critical_unhandled)
+            );
 
         $body->add(new HtmlElement('div', ['class' => 'donut'], new HtmlString($donut->render())));
     }
@@ -56,6 +58,6 @@ class ServiceSummaryDonut extends Card
 
     protected function assembleHeader(BaseHtmlElement $header)
     {
-        $header->add(new HtmlElement('h2', null, mt('icingadb', 'Service Summary')));
+        $header->add(new HtmlElement('h2', null, t('Service Summary')));
     }
 }
diff --git a/library/Icingadb/Widget/ShowMore.php b/library/Icingadb/Widget/ShowMore.php
index 1ebb4a79..3574a59b 100644
--- a/library/Icingadb/Widget/ShowMore.php
+++ b/library/Icingadb/Widget/ShowMore.php
@@ -37,7 +37,7 @@ class ShowMore extends BaseHtmlElement
 
     public function getLabel()
     {
-        return $this->label ?: 'Show More';
+        return $this->label ?: t('Show More');
     }
 
     protected function assemble()
diff --git a/library/Icingadb/Widget/StateListItem.php b/library/Icingadb/Widget/StateListItem.php
index ddf4044c..bf277e0f 100644
--- a/library/Icingadb/Widget/StateListItem.php
+++ b/library/Icingadb/Widget/StateListItem.php
@@ -33,7 +33,7 @@ abstract class StateListItem extends BaseListItem
     protected function assembleCaption(BaseHtmlElement $caption)
     {
         if ($this->state->soft_state === null && $this->state->output === null) {
-            $caption->add(Text::create(mt('icingadb', 'Waiting for Icinga DB to synchronize the state.')));
+            $caption->add(Text::create(t('Waiting for Icinga DB to synchronize the state.')));
         } else {
             $caption->add(CompatPluginOutput::getInstance()->render($this->state->output));
         }
@@ -41,11 +41,11 @@ abstract class StateListItem extends BaseListItem
 
     protected function assembleTitle(BaseHtmlElement $title)
     {
-        $title->add([
+        $title->add(Html::sprintf(
+            t('%s is %s', '<hostname> is <state-text>'),
             $this->createSubject(),
-            ' is ',
             Html::tag('span', ['class' => 'state-text'], $this->state->getStateTextTranslated())
-        ]);
+        ));
     }
 
     protected function assembleVisual(BaseHtmlElement $visual)
@@ -81,7 +81,7 @@ abstract class StateListItem extends BaseListItem
     {
         if ($this->state->is_overdue) {
             $since = new TimeSince($this->state->next_update);
-            $since->prepend('Overdue ');
+            $since->prepend(t('Overdue') . ' ');
             $since->prepend(new Icon(Icons::WARNING));
             return $since;
         } elseif ($this->state->last_state_change !== null) {