acknowledgements 3.0.0

This release is compatible with D10 & D11
### Fixed
- Role names now display as human-readable labels instead of machine names
## Submit Button Customization
- **Configurable CSS classes for Submit button** in admin settings
- New field "Submit button CSS classes" in Layout section
- Support for Bootstrap and other CSS framework classes
- Classes apply to both CheckboxForm and AlternateForm
### Added
- **Configurable placeholders** for annotation field in admin settings (/admin/config/people/acknowledge)
- Separate placeholder for optional annotation field
- Separate placeholder for required annotation field
- Default Italian placeholders for school assembly/strike use cases