Update German strapi-admin translations

[pr0gr8mm3r]

What does it do?

Fixes grammar, adds missing translations and reorders existing ones to match the order of the English translations.

[codecov]

Codecov Report

Merging #10207 (3be3bde) into master (3198d19) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #10207   +/-   ##
=======================================
  Coverage   57.86%   57.86%           
=======================================
  Files         183      183           
  Lines        6348     6348           
  Branches     1392     1392           
=======================================
  Hits         3673     3673           
  Misses       2215     2215           
  Partials      460      460           

Flag	Coverage Δ
front	∅ <ø> (∅)
unit	57.86% <ø> (ø)

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[alexandrebodin]

LGTM