I18n.js

// @flow
export default class I18n {
    translations: {
        messages: {},
        routes: {}
    } = {
        messages: {},
        routes: {}
    };

    locale: string = 'pt_BR';

    constructor(): ?this {
        const language: string = window.navigator.userLanguage || window.navigator.language;

        this.setLocale(language);

        /** @todo fix this */
        const messages: {} = {
            'pt_BR': require('../translations/messages.pt_BR.js').default,
            'en': require('../translations/messages.en.js').default
        };

        const routes: {} = {
            'pt_BR': require('../translations/routes.pt_BR.js').default,
            'en': require('../translations/routes.en.js').default
        };

        this.translations.messages = messages;
        this.translations.routes = routes;

        return this;
    }

    setLocale(newLocale: string) {
        let localeCode: string = 'en';

        switch (newLocale) {
            case 'pt-BR':
            case 'pt_BR':
                    localeCode = 'pt_BR';
                break;
        }

        this.locale = localeCode;
    }

    getTranslations(): {} {
        return {
            ...this.translations.messages[this.locale],
            route: this.translations.routes[this.locale]
        };
    }
}

const I18nClass = new I18n();

export const i18nHelper = I18nClass;
export const i18n = i18nHelper.getTranslations();