New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  selectedLanguage: "ES",
  
  data: [
    { id: 'EN', label: 'English' },
    { id: 'ES', label: 'Spanish' },
    { id: 'DE', label: 'German' }
  ]
});

templates.application.hbs

selectedLanguage = {{selectedLanguage}}

<br>

{{one-way-select selectedLanguage
    options=users
    optionTargetPath="id"
    optionLabelPath="label"
    update=(action (mut selectedLanguage))
}}

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.15.3",
    "ember-template-compiler": "2.15.3",
    "ember-testing": "2.15.3"
  },
  "addons": {
    "ember-data": "2.16.3",
    "ember-one-way-select": "latest"
  }
}