/**
  * Constructor.
  * @param $form Form the associated form
  * @param $field string the name of the associated field
  * @param $type string the type of check, either "required" or "optional"
  * @param $message string the error message for validation failures (i18n key)
  * @param $requiredLocale string The symbolic name of the required locale
  */
 function __construct(&$form, $field, $type, $message, $requiredLocale = null)
 {
     $validator = new ValidatorEmail();
     parent::__construct($form, $field, $type, $message, $requiredLocale, $validator);
 }