protected function renderHelpBlock(ElementInterface $oElement)
    {
        if ($sHelpBlock = $oElement->getOption('help-block')) {
            if ($oTranslator = $this->getTranslator()) {
                $sHelpBlock = $oTranslator->translate($sHelpBlock, $this->getTranslatorTextDomain());
            }
            $sHelpBlockString = strip_tags($sHelpBlock);
            if ($sHelpBlock === $sHelpBlockString) {
                $sHelpBlock = $this->getEscapeHtmlHelper()->__invoke($sHelpBlock);
            }
            return sprintf(static::$helpBlockFormat, $sHelpBlock);
        } else {
            return '';
        }
    }