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

Hi,
I translated the updated donate page. Please review:

https://gitlab.com/spriver/tails.git
branch: de_donate
HEAD commit: 42a7201c25 Translated new strings. Changed "müssen sollte"
to "sollte" as the former translation uses two modal verbs consecutively.

Affected file:
wiki/src/donate.de.po

Cheers!
spriver