Support for Internationalization

[Emerson]

We need to figure out a way to handle multilingual labels and general internationalization

[jelhan]

I didn't see why this should be addressed by ember-formm-master-2000. E.g. ember-i18n and ember-form-master-2000 plays nicely together using this syntax:

{{#fm-form}}
  {{fm-field label=(t 'field.label') placeholder=(t 'field.placeholder')}}
  {{#fm-submit}}
    {{t 'form.submit'}}
  {{/fm-submit}}
{{/fm-form}}

Should be the same for other i18n addons.