admin-on-rest-fr05t1k/src/i18n/TranslationUtils.js

A frontend Framework for building admin applications on top of REST services, using ES6, React and Material UI

import { DEFAULT_LOCALE } from './index';

export const resolveBrowserLocale = (defaultLocale = DEFAULT_LOCALE) => {
    // from http://blog.ksol.fr/user-locale-detection-browser-javascript/
    // Rely on the window.navigator object to determine user locale
    const { language, browserLanguage, userLanguage } = window.navigator;
    return (language || browserLanguage || userLanguage || defaultLocale).split('-')[0];
};