/**
  * @see Form::validate()
  */
 public function validate()
 {
     // prefix
     $this->validatePrefix();
     // subject, text, captcha
     parent::validate();
     // username
     $this->validateUsername();
     // poll
     if ($this->showPoll) {
         $this->pollEditor->checkParams();
     }
     // language
     $this->validateLanguage();
 }