[Tails-l10n] (review)[de] Tails 2.7.1 release notes

Hi,
I translated the release notes for 2.7.1.
Please review:

https://gitlab.com/spriver/tails.git
branch: de_tails_271
HEAD commit: 49c42cd Initial translation

Affected files:
wiki/src/news/version_2.7.1.de.po
wiki/src/security/Numerous_security_holes_in_2.7.de.po

Cheers!
spriver