https://stackoverflow.com/questions/44626081/use-ember-intl-along-with-ember-i18n

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

helpers.t.js

export { default } from 'ember-i18n/helper';

locales.en.translations.js

export default {
  foo: 'hi from ember i18n!'
}

templates.application.hbs

<h1>See helpers/t.js for re-export info</h1>
<br>
<br>
{{outlet}}

{{t 'foo'}}
<br>
<br>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1",
    "ember-i18n": "5.0.1",
    "ember-intl": "2.23.1"
  }
}