Configure ember i18n

I'm trying to use the ember addon ember-i18n, i already read all the documentation, but i just can't figure out why is not working.

I have already installed the addon and generated three locations: en-us, pt-BR and es. I have already put in my settings:

i18n: {
  defaultLocale: 'pt-BR'
}

And added in the pt-BR file:

'use strict';
export default {
  'testing': 'testing test'
};

But don't seems to work. What could be the problem??