lajax\translatemanager\models\searches\LanguageSourceSearch::_getSourceLanguage PHP Метод

    private function _getSourceLanguage()
    {
        $languageSourceSearch = Yii::$app->request->get('LanguageSourceSearch', []);
        return isset($languageSourceSearch['source']) ? $languageSourceSearch['source'] : Yii::$app->sourceLanguage;
    }