German translation, from Alexander Hesse
Remove unused (and un-locale'd) translations.
Add transifex configuration file.
Merge remote-tracking branch 'origin/translations' into translations
Rename german translation files.
Fixup German translation files.

* Change locale code
* Remove english originals - these will bitrot over time anyway, and aren't necessary with transifex
* dos2unix line endings
* Fix a few typos in the translations (closing quotes, extraneous spaces etc)
Add main translation file for de-DE.
Add translation notes.
Merge branch 'translations' into staging