a few changes to make A/B testing easier

server/languages.js

@@ -0,0 +1,16 @@
+const { availableLanguages } = require('../package.json');
+const config = require('./config');
+const fs = require('fs');
+const path = require('path');
+
+function allLangs() {
+  const langs = fs.readdirSync(path.join(__dirname, '..', 'public', 'locales'));
+  langs.unshift('en-US'); // default first, TODO change for fluent-langneg
+  return langs;
+}
+
+if (config.l10n_dev) {
+  module.exports = allLangs();
+} else {
+  module.exports = availableLanguages;
+}