Add the ability to use Phrase App

https://code.google.com/p/otwarchive/issues/detail?id=4015

Phrase App is a translation application that we want to use on the i18n site to allow the translation group to generate translations for the archive.

There should be no change on the test site and beta.  However check the footers still work :)

Elz has commented upon this in the past

This also fixes an issue where the headers go though the translation system twice.
One more thing! Travis fails for good reason, this time: you may have removed the accidentally added rollout, but you haven't re-run `bundle install`, which means that the Gemfile.lock still has two references to rollout. The solution, as Travis says, is to:
 Run `bundle install` elsewhere and add the updated Gemfile.lock to version control.

(As a quick reminder, Gemfile is the file you update manually to add or remove gems, Gemfile.lock is the file that gets produced automatically when running `bundle install`.)