[Tails-l10n] (review)[de] 2.2 Release notes

Hi,
I translated the release notes for 2.2 (and translated one missing
string in the 2.0 release notes).
Please review:

https://gitlab.com/spriver/tails.git
branch: de_tails_22
HEAD commit: b07e685 Translated missing string

Affected files:
wiki/src/news/version_2.0.de.po
wiki/src/news/version_2.2.de.po
wiki/src/security/Numerous_security_holes_in_2.0.1.de.po


Cheers!
spriver