public function getImageContent()
 {
     if (!AccountManager::getInstance()->isLogged()) {
         return JsonResponseBuilder::failure();
     }
     $FileLang = $this->getRequestVariable('FileLang');
     $FilePath = $this->getRequestVariable('FilePath');
     $FileName = $this->getRequestVariable('FileName');
     $file = new File($FileLang, $FilePath . $FileName);
     $imageContent = $file->getImageContent();
     header("Content-Type: " . $imageContent['content-type']);
     header("Expires: 0");
     header("Cache-Control: no-cache, must-revalidate");
     header("Pragma: no-cache");
     return $imageContent['content'];
 }