himiklab\yii2\recaptcha\ReCaptcha::getLanguageSuffix PHP Method

    protected function getLanguageSuffix()
    {
        $currentAppLanguage = Yii::$app->language;
        $langsExceptions = ['zh-CN', 'zh-TW', 'zh-TW'];
        if (strpos($currentAppLanguage, '-') === false) {
            return $currentAppLanguage;
        }
        if (in_array($currentAppLanguage, $langsExceptions)) {
            return $currentAppLanguage;
        } else {
            return substr($currentAppLanguage, 0, strpos($currentAppLanguage, '-'));
        }
    }