Improve and complete German translations

[meauxt]

Summary

I encountered a merge conflict while merging the Crowdin translations, this is a new pull request from #239 with the commits to resolve the conflicts.

• This update improves and completes the German (de) translations throughout the app.
• It merges the latest changes from the development branch, which includes new Crowdin translation keys, to resolve conflicts and fill in the German translations for the newly added keys.
  Credit to DelayLama for the PR

[gitguardian]

⚠️ GitGuardian has uncovered 1 secret following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
36641998	Triggered	Username Password	35b9d86	public/locales/de/auth.json	View secret

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[DelayLama]

Thank you very much!