app.js

gistfile1.js

Ember.Application.initializer({
  name: "i18n", // <- this

  initialize: function(container, application) {
    container.register('i18n:main', i18n);
  }
});

Ember.Application.initializer({
  name: "injectI18n",
  before: ["i18n"], // <- should match this, so that it runs before this

  initialize: function(container, application) {
    application.inject('component', 'i18n', 'i18n:main');
    application.inject('controller', 'i18n', 'i18n:main');
  }
});