bitwarden-browser/src/services/i18n.service.ts

import { I18nService as BaseI18nService } from 'jslib/services/i18n.service';

export class I18nService extends BaseI18nService {
    constructor(systemLanguage: string, localesDirectory: string) {
        super(systemLanguage, localesDirectory, async (formattedLocale: string) => {
            const filePath = this.localesDirectory + '/' + formattedLocale + '/messages.json';
            const localesResult = await fetch(filePath);
            const locales = await localesResult.json();
            return locales;
        });

        this.supportedTranslationLocales = [
            'en', 'es',
        ];
    }
}