Build languages.js

`native` should probably be used for the newsletter dropdown. Currently that will show "French" if your language is set to English instead of Français. I was using this for the native review languages changes I'm working on.

![screenshot 2014-12-30 17 00 40](https://cloud.githubusercontent.com/assets/211578/5583869/69f2b14a-9045-11e4-801e-072626fde658.png)