/**
  * Remove/delete a Notebook entry
  */
 public function remove()
 {
     if (!$this->is_allowed_to_edit()) {
         $this->forbidden();
         return;
     }
     $item = Request::get_item_key();
     $success = Notebook::repository()->remove($item);
     $message = $success ? '' : get_lang('Error');
     $this->response($success, $message);
 }