Add CSRF protections

app/Templates/task_edit_description.php

@@ -4,6 +4,8 @@
 
 <form method="post" action="?controller=task&amp;action=saveDescription&amp;task_id=<?= $task['id'] ?>" autocomplete="off">
 
+    <?= Helper\form_csrf() ?>
+
     <?= Helper\form_hidden('id', $values) ?>
     <?= Helper\form_textarea('description', $values, $errors, array('required', 'placeholder="'.t('Leave a description').'"'), 'description-textarea') ?><br/>
     <div class="form-help"><a href="http://kanboard.net/documentation/syntax-guide" target="_blank" rel="noreferrer"><?= t('Write your text in Markdown') ?></a></div>