packages/issue-dashboard-widgets/widgets/due-dates-calendar/app/translations.js

import {setLocale} from 'hub-dashboard-addons/dist/localization';

const translationFiles = require.context('./translations/', true, /\.po$/);

const translations = translationFiles.keys().reduce((result, fileKey) => {
  const lang = fileKey.split('.po')[0].split('_')[1];
  const fileJson = translationFiles(fileKey);
  result[lang] = Object.keys(fileJson).reduce(
    (accumulator, propertyKey) =>
      ({...accumulator, ...fileJson[propertyKey]}),
    {}
  );
  return result;
}, {});

export function initTranslations(locale) {
  if (translations[locale]) {
    setLocale(locale, translations);
  }
}