Improve notifications

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

app/Template/notification/task_internal_link_create_update.php

@@ -3,7 +3,7 @@
 <p>
     <?= e('This task is now linked to the task %s with the relation "%s"',
           $this->url->absoluteLink(t('#%d', $task_link['opposite_task_id']), 'TaskViewController', 'show', array('task_id' => $task_link['opposite_task_id'])),
-          $this->text->e($task_link['label'])) ?>
+          e($task_link['label'])) ?>
 </p>
 
 <?= $this->render('notification/footer', array('task' => $task)) ?>