- Introduced a new field for native language in the VocabCourse model to allow learners to specify their native language.
- Updated the VocabService to handle native language during course creation and retrieval, including filtering options.
- Enhanced the database schema to include foreign key constraints for native language.
- Updated frontend components to support native language selection and display in course listings.
- Added internationalization strings for native language features in both German and English.
- Added new course management functionalities in VocabController, including creating, updating, and deleting courses and lessons.
- Implemented enrollment and progress tracking for courses, along with grammar exercise creation and management.
- Updated database schema to include tables for courses, lessons, enrollments, and grammar exercises.
- Enhanced frontend with new routes and views for course listing and details, including internationalization support for course-related texts.
- Improved user experience by adding navigation to courses from the main vocab trainer view.
