Add Submit and Quit Feature

[obiora198]

Add Submit and Quit Feature

What does this PR do?

• Adds a "Submit and Quit" button to allow users to end quizzes early
• Preserves attempted answers and calculates partial scores
• Includes confirmation dialog to prevent accidental quitting
• Supports localization for all text elements

Why is this needed?

• Users may need to exit quizzes prematurely due to time constraints or other reasons
• Provides better user experience by saving progress instead of losing all data
• Aligns with common quiz platform functionality

Changes Made

1. Added handleQuitQuiz function to handle early submission
2. Implemented confirmation modal component
3. Added localization support for quit-related text
4. Updated CSS for new UI elements
5. Maintained backward compatibility

Screenshots

Testing

• [x] Tested quit functionality with completed questions
• [x] Tested quit functionality with no questions attempted
• [x] Verified score calculation accuracy
• [x] Tested localization support
• [x] Verified no breaking changes to existing features