* fix: Update tests to include language parameter
- Add language to parse_arguments tests
- Update mock expectations for SpeechRecognitionManager to include language
- Fixes test failures after language support merge
* fix: Update tests for language support and fix None argument handling
- Fix test_parse_arguments_defaults to expect None for model/engine/language
- Add language_combo mock to settings_dialog tests
- Add language attribute to dialog mock setup
- Include language in get_selected_settings mock return values
- Update mock_config_manager to include language in return value
