i18n(de): Optimize and standardize German translations (#19911)

* i18n(de): Optimize and standardize German translations for consistency and tone

- Unified user addressing to the formal "Sie" (polite form) throughout the UI, retaining "Du" only for specific persona contexts
- Fixed context-specific translation errors (e.g., "Call" from "Anrufen" to "Aufrufen", "Generation" from "Generation" to "Generierung", "Dokomentenintelligenz" typo)
- Corrected hyphenation for compound nouns (e.g., "JSON-Datei", "API-Schlüssel", "Prompt-Variable") and general grammar
- Improved tone and clarity of error messages and prompts for better readability and a more professional UI tone
- Standardized technical concepts across all translation files

* Update translations based on the feedback provided

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Co-authored-by: Tim Baek <tim@openwebui.com>
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MichaelandTim Baek authored and GitHub committed 2025-12-12 11:16:07 -05:00
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