public function setForceDefaultLang(string $force_default_lang = "T") : CNabuDataObject
    {
        if ($force_default_lang === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$force_default_lang")
            );
        }
        $this->setValue('nb_site_user_force_default_lang', $force_default_lang);
        
        return $this;
    }