Make node accept more locales

i18n.js

import areIntlLocalesSupported from 'intl-locales-supported'

const localesMyAppSupports = [
  'fr',
  'en',
]

if (global.Intl) {
  // Determine if the built-in `Intl` has the locale data we need.
  if (!areIntlLocalesSupported(localesMyAppSupports)) {
    // `Intl` exists, but it doesn't have the data we need, so load the
    // polyfill and patch the constructors we need with the polyfill's.
    var IntlPolyfill    = require('intl');
    Intl.NumberFormat   = IntlPolyfill.NumberFormat;
    Intl.DateTimeFormat = IntlPolyfill.DateTimeFormat;
  }
} else {
  // No `Intl`, so use and load the polyfill.
  global.Intl = require('intl');
}