un-enforce_available_locales before loading language files, or else you get deprication warnings

```
> bundle exec rails c
[deprecated] I18n.enforce_available_locales will default to true in the future. If you really want to skip validation of your locale you can set I18n.enforce_available_locales = false to avoid this message.
Loading development environment (Rails 4.0.3)
irb(main):001:0>
```

Disabling the locale enforcement first fixes this.