/**
  * @param string $theme
  * @param string $template
  * @param string $content
  * @return JSONResponse
  */
 public function update($theme, $template, $content)
 {
     try {
         $template = new MailTemplate($theme, $template);
         $template->setContent($content);
         return new JSONResponse();
     } catch (\Exception $ex) {
         return new JSONResponse(array('message' => $ex->getMessage()), $ex->getCode());
     }
 }