/**
  * @NoAdminRequired
  */
 public function renameTag($old_name = "", $new_name = "")
 {
     if ($old_name == "" || $new_name == "") {
         return new JSONResponse(array(), Http::STATUS_BAD_REQUEST);
     }
     Bookmarks::renameTag($this->userId, $this->db, $old_name, $new_name);
     return new JSONResponse(array('status' => 'success'));
 }