[Validator] Completed German translations
minor #10745 [Validator] Completed German translations (mweimerskirch)

This PR was merged into the 2.4 branch.

Discussion
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[Validator] Completed German translations

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | n/a
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
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47e5a4b [Validator] Completed German translations