Typo and better wording for german validator translation
minor #9599 [Validator] Typo and better wording for german validator translation (Danez)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #9599).

Discussion
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[Validator] Typo and better wording for german validator translation

Follow up of #9588 as supposed by @craue

Commits
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263b618 Typo and better wording for german validator translation