New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  i18n: Ember.inject.service(),
  columnsToEdit: Ember.computed('i18n.locale', function() {
    let i18n = this.get('i18n');
    return Ember.A([
      {
        "propertyName": "name",
        "title": i18n.t('Name')
      },
      {
        "propertyName": "phone",
        "title": i18n.t('Name'),        
      },
    ]);
  }),

  columns: Ember.computed.map('columnsToEdit.[]', function(column){
    return column;
  }),
});

services.i18n.js

import Ember from 'ember';

const translations = {
  en: {
    Name: 'the name'
  },
  de: {
    Name: 'der Name'
  }
}

export default Ember.Service.extend({
  init() {
    this.set('locale', 'en');
  },
  t(key) {
    return translations[this.get('locale')][key];
  }
});

templates.application.hbs

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

<button onclick={{action (mut i18n.locale) "en"}}>en</button>
<button onclick={{action (mut i18n.locale) "de"}}>de</button>

<h2>Columns:</h2>
<ul>
  {{#each columns as |c|}}
		<li>
    	<strong>{{c.propertyName}}</strong>:
      {{c.title}}
    </li>
	{{/each}}
</ul>

<h2>columnsToEdit</h2>
<ul>
  {{#each columnsToEdit as |c|}}
		<li>
    	<strong>{{c.propertyName}}</strong>:
      {{c.title}}
    </li>
	{{/each}}
</ul>

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"
  }
}