Sweil/Frogsystem-2 — pull request #51 by Thoronador (2012-06-19 05:07:45+00:00)
Title: add/improve English language files (en_US)

I tried to complete the English language files. There should be a corresponding English language file to each German language file - which is the case after including those commits.
The translations might still be a bit inaccurate or there might even be a few untranslated German lines (not sure whether I did get all those), but in general the English language support has vastly improved.

Besides, I also fixed a few spelling mistakes in some German language files.