Changes:
- Upgrade to Django 5.2 LTS
- Filter "Show all feedback for this exercise" #128
- Fix student feedback message not being cleared on submit
- Implement HTML sanitization for student and teacher messages #132
- Do not auto-grade empty messages if previous unread feedback exists #121
- Add "Add deadline deviation" button
Release notes:
https://apluslms.github.io/releases/v1_31.html