ember: dynamic language in templates. use LanguageController?

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  actions: {
    switchLanguage: function() {
      var t = this.get('translator');
      if(t.lang === "t1") {
        t.changeLanguage("t2");
      } else {
        t.changeLanguage("t1");
      }
    }
  },
  appName:'Ember Twiddle',
  translator: Ember.inject.service()
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}

{{translator.current.a}}
{{translator.current.b}}

<button {{action 'switchLanguage'}}>Switch lang</button>

<br>
<br>

services.translator.js

import Ember from "ember";

export default Ember.Service.extend({
  lang: 't1', // For reference
  current: {},
  init: function() {
  	this.current = this.translations[this.lang];
  },
  changeLanguage: function(lang) {
    this.set('lang', lang);
    this.set('current', this.translations[lang]);
  },
  translations: {
    t1: {a: 'T1:A', b: 'T1:B'},
    t2: {a: 'T2:A', b: 'T2:B'}
  }
});

twiddle.json

{
  "version": "0.4.9",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.11/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember-template-compiler.js"
  }
}