[Tails-l10n] [review](de) about page

Hi,

Please review
https://gitorious.org/flapflap/tailsxlat.git
branch de-about

Commits:
f3586c5 remove stray-previous-msgid msgids

I translated some missing and/or fuzzy strings in
wiki/src/about.de.po

It's only a couple of lines so should be easy for review.

~flapflap