Improve notifications

- Translate subtask status
- Translate internal link labels
- Add link to tasks and projects in overdue notifications

app/Template/notification/task_internal_link_delete.php

@@ -2,7 +2,7 @@
 
 <p>
     <?= e('The link with the relation "%s" to the task %s has been removed',
-          $this->text->e($task_link['label']),
+          e($task_link['label']),
           $this->url->absoluteLink(t('#%d', $task_link['opposite_task_id']), 'TaskViewController', 'show', array('task_id' => $task_link['opposite_task_id']))) ?>
 </p>