* PowerAccent with multi-language selection
- Updated Language enum, method signatures, and settings to support multiple language selections.
- Remove ALL language and added special characters language instead.
- Modified UI to use ListView with checkboxes for language selection, including a "Select All" option.
- Adjusted ViewModel and code-behind to handle multi-selection logic.
- Updated Resources.resw and PowerAccentViewModel.cs to reflect these changes.
* Changes Language selection UI
- Groups languages into two groups
- Sort them by localized language name
- Remove unneeded looping when no languages selected
