fix tutorial training exp bug
correct create training grade for skippable training
fix typo in training submission controller
fix mcq option alignment
fix forum participation authorization bug
student can see their own hidden topic
fix for skippable training partial grading problem
fix issue accessing forum
duplicated assignments default unpublished

https://trello.com/c/6eybL1SK/357-improve-duplicated-trainings-and-missions-should-be-unpublished
red background colour for unread post
enable user to see their own hidden posts
refactor: material_folder -> root_folder
material notification only show opened folder
better forum subscription UI
fix drop down trigger on hover gap
direct home page to my courses page if user has no course
better lecturer request form
fix students unable to unsubscribe forum
training will still be able to grade correctly after change from skippable to not skippable
refactoring background tasks of assignment