[Tails-l10n] (review)[de] "about" section for 2.4

Hi,
this one is a bit more work:

https://gitlab.com/spriver/tails.git
Branch: de_about
HEAD commit: e3351ce Translated new and fuzzy strings
Affected files:
wiki/src/about.de.po
wiki/src/doc/about/license.de.po
wiki/src/doc/about/openpgp_keys.de.po

Cheers!
spriver