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.
Again, strictly a matter of style: we (and the Ruby community in general) prefer to leave one space between operators and operands, but only one. (So this should be ```key = options[:key] + '.' ```.)