Macro inspired by ember-i18n

[karellm]

I think the macro idea from ember-i18n is really neat: https://github.com/jamesarosen/ember-i18n/wiki/Doc:-Translating-Text#translation-computed-property-macro

It would be nice to have that here too. For now I ported the code to my project but if it is something you want maybe I can work on a PR.

[heathharrelson]

Sorry for the slow response. I wasn't aware of this macro in ember-i18n, and I like the idea a lot. However, I'm not crazy about the syntax used in ember-i18n, because it doesn't match most computed property macros. Using the example from the documentation above, I would prefer something that looked like this:

import { translationMacro as t } from "ember-i18next";

export default Ember.Component.extend({
  // A simple translation.
  title: t('user.edit.title'),

  followersCount: 1,
  count: Ember.computed.alias('followersCount'),

  // A translation with interpolations. This computed property
  // depends on `count` and will send `{ count: this.get('count') }`
  // in to the translation.
  followersTitle: t('user.followers.title', 'count')
});

The main difference being that the arguments to the macro are dependent property names rather than an options hash.

I'd be happy to accept a PR that matches the example above. No worries if you don't currently have the time; I can quickly implement it myself before the next release.