message: Fix tests
  We do not have a en.json but a en_EN.json
diff: @@ -141,11 +141,11 @@ export function setLanguage(preferredLangs) {
  console.log("set language to " + langToUse);
  // Set 'en' as fallback language:
  - if (langToUse != "en") {
  - return getLanguage(i18nFolder + availLangs['en'].fileName);
  + if (langToUse != "en_EN") {
  + return getLanguage(i18nFolder + availLangs['en_EN'].fileName);
  }
  }).then((langData) => {
  - if (langData) counterpart.registerTranslations('en', langData);
  + if (langData) counterpart.registerTranslations('en_EN', langData);
  });
  };
  