Refactor external source files to live in app/

app/locale.js

@@ -0,0 +1,29 @@
+const path = require('path');
+const fs = require('fs');
+
+function normalizeLocaleName(locale) {
+  if (/^en-/.test(locale)) {
+    return 'en';
+  }
+
+  return locale;
+}
+
+function getLocaleMessages(locale) {
+  const onDiskLocale = locale.replace('-', '_');
+
+  const targetFile = path.join(
+    __dirname,
+    '..',
+    '_locales',
+    onDiskLocale,
+    'messages.json'
+  );
+
+  return JSON.parse(fs.readFileSync(targetFile, 'utf-8'))
+}
+
+module.exports = {
+  normalizeLocaleName,
+  getLocaleMessages
+}