feat: Add language selector

Closes #212

client/src/locales/en/index.js

@@ -0,0 +1,11 @@
+import merge from 'lodash/merge';
+
+import login from './login';
+import core from './core';
+
+export default {
+  language: 'en',
+  country: 'us',
+  name: 'English',
+  embeddedLocale: merge(login, core),
+};