Update German translations

[CompileNix]

Update missing German translations in frontend/messages/de.json.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 7b01500c-5d78-43ae-922a-5ff8a281ce9f

📥 Commits

Reviewing files that changed from the base of the PR and between e378e08 and 7a44e8a.

📒 Files selected for processing (1)

• frontend/messages/de.json

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Walkthrough

Changes

German localization

Layer / File(s)	Summary
Media and chat message translations frontend/messages/de.json	The German catalog now translates video and channel loading or error messages, plus video-chat loading, user-message, and empty-chat messages.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: updating German translations.
Description check	✅ Passed	The description directly explains that missing German translations were added to frontend/messages/de.json.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Zibbp]

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