Add language to Germany(DE)

Trac Comment 1 by —2014-09-17T16:28:42.537Z

Review data; need to assess fluency level (18% French sounds high).

Trac Comment 2 by federicoleva@9e143f0cbaa51b6c—2014-09-19T13:50:40.743Z

18% French sounds high

Don't forget the http://en.wikipedia.org/wiki/Élysée_Treaty

Trac Comment 3 by —2015-02-17T00:20:18.173Z

18% may be high for French, however, we didn't previous list French in Germany at all, so this is a better number than not having it at all. I've updated this. Also, the percentages are better than some raw pop numbers we had for the others, so I expect them to track better going forward.