public function addI18n(string $language, ConfigLoader $loader) : AppConfigBuilder
    {
        $this->i18nLoaders[$language][] = $loader;

        return $this;
    }
public function addI18n(string $language, ConfigLoader $loader) : AppConfigBuilder
    {
        $this->i18nLoaders[$language][] = $loader;

        return $this;
    }
@param string       $language
@param ConfigLoader $loader

@return AppConfigBuilder