Translate missing words in e-mail notifications

Some "Thanks" were written in e-mail notifications but was not
translated. The "@lang" directive was added around.

See #3690

resources/views/notifications/component/update.blade.php

@@ -3,9 +3,9 @@
 
 {{ $content }}
 
-Thanks,<br>
+@lang('Thanks,')<br>
 {{ Config::get('setting.app_name') }}
 
 @include('notifications.partials.subscription')
 
-@endcomponent
+@endcomponent

resources/views/notifications/incident/new.blade.php

@@ -7,7 +7,7 @@
 {{ $actionText }}
 @endcomponent
 
-Thanks,<br>
+@lang('Thanks,')<br>
 {{ Config::get('setting.app_name') }}
 
 @include('notifications.partials.subscription')

resources/views/notifications/incident/update.blade.php

@@ -7,7 +7,7 @@
 {{ $actionText }}
 @endcomponent
 
-Thanks,<br>
+@lang('Thanks,')<br>
 {{ Config::get('setting.app_name') }}
 
 @include('notifications.partials.subscription')

resources/views/notifications/schedule/new.blade.php

@@ -3,9 +3,9 @@
 
 {{ $content }}
 
-Thanks,<br>
+@lang('Thanks,')<br>
 {{ Config::get('setting.app_name') }}
 
 @include('notifications.partials.subscription')
 
-@endcomponent
+@endcomponent