getCurrentSystemLocale example

        if ($email) {
            $this->setSystemConfig('core.basicInformation.email', $email);
        }
    }

    public function setDefaultLanguage(string $locale): void
    {
        $locale = str_replace('_', '-', $locale);

        $currentLocale = $this->getCurrentSystemLocale();

        if (!$currentLocale) {
            throw new ShopConfigurationException('Default language locale not found');
        }

        $currentLocaleId = $currentLocale['id'];
        $newDefaultLocaleId = $this->getLocaleId($locale);

        // locales match -> do nothing.         if ($currentLocaleId === $newDefaultLocaleId) {
            return;
        }