An unexpected error occurred.
The Symfony\Component\Intl\NumberFormatter\NumberFormatter::__construct() method's argument $locale value 'en_GB' behavior is not implemented. Only the locale "en" is supported. Please install the "intl" extension for full localization capabilities.

$locales = [
            'en' => t('English (United States)'),
            'ja_jp' => t('Japanese'),
        ];