Use popover to edit task and description directly from board.

- Click on 'description' icon opens the 'edit-description' page.
- Edit task and edit description now open in popover, like the assign
dialog.

app/Templates/task_edit_description.php

@@ -2,7 +2,7 @@
     <h2><?= t('Edit the description') ?></h2>
 </div>
 
-<form method="post" action="?controller=task&amp;action=saveDescription&amp;task_id=<?= $task['id'] ?>" autocomplete="off">
+<form method="post" action="?controller=task&amp;action=saveDescription&amp;task_id=<?= $task['id'] ?>&amp;ajax=<?= $ajax ?>" autocomplete="off">
 
     <?= Helper\form_csrf() ?>
 
@@ -13,6 +13,11 @@
     <div class="form-actions">
         <input type="submit" value="<?= t('Save') ?>" class="btn btn-blue"/>
         <?= t('or') ?>
+<?php if ($ajax): ?>
+        <a href="?controller=board&amp;action=show&amp;project_id=<?= $task['project_id'] ?>"><?= t('cancel') ?></a>
+<?php else: ?>
         <a href="?controller=task&amp;action=show&amp;task_id=<?= $task['id'] ?>"><?= t('cancel') ?></a>
+<?php endif ?>
     </div>
 </form>
+