I18n and L10n

Closes #30 

This could be it: `angular-translate` is looking good.

All pieces are in place to support English and German. We want to add French at least. Italian, Croation - but we have to need for outside help. Once we have a richer dictionary of strings to translate, we could try perseids-dev to ask for collaborateurs.

`unusedTokenHighlighter` shows how to use the `translate` directive, navbar buttons and the searchCtrl the `translate` filter.

What do you think? Shall we go with this?