- Remove unused translation entries from translations.de.yaml
- Improve translation test to better detect obsolete entries
- Add KNOWN_NEEDED_MODULES for special cases
- Add helper function _message_exists_in_code for better translation verification
- Improve error messages to show both original and translated text
- Fix import sorting in test file
This commit improves the maintainability of the translation system by
removing unused entries and enhancing the verification process.