message: Fix import of language index
  This is a similar fix to
diff: @@ -410,11 +410,12 @@ export function pickBestLanguage(langs) {
  }
  function getLangsJson() {
  - return new Promise((resolve, reject) => {
  + return new Promise(async (resolve, reject) => {
  let url;
  try {
  // $webapp is a webpack resolve alias pointing to the output directory, see webpack config
  - url = require('$webapp/i18n/languages.json');
  + url = import('$webapp/i18n/languages.json');
  + if (url.then) url = (await url).default; // webpack resolves to a Module through a promise.
  } catch (e) {
  url = i18nFolder + 'languages.json';
  }
  