FluidTYPO3\Vhs\ViewHelpers\Condition\Page\IsLanguageViewHelper::initializeArguments PHP Метод

    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerArgument('language', 'string', 'language to check', true);
        $this->registerArgument('defaultTitle', 'string', 'title of the default language', false, 'en');
    }