ConfirmationModal and Exam UI improvements
This merge request improves the ConfirmationModal as well as several things in the Exam view.
- Allow the ConfirmationModal title to span multiple lines to make sure the full text is always visible.
- Let the 'Delete problem' button in the exam editor use the ConfirmationModal for confirmation instead of the default browser confirmation window.
- Disable the 'Delete problem' button when an exam is finalized.
Edited by Hugo Kerstens