mod/assign: Show a message to teacher when student removes their own submission
mod/assign: Fixed bug when groupmembersonly selected and there are empty groups
MDL-34432: Allow comment inline (stripping embedded images version)
mod/forum: Mostrar els missatges no llegits en el selector de grup
MDL-31679 gradereport_grader: Add a horizontal scroll bar to the top of the grader report
MDL-38555 forms: Prevent same data submission multiple times.

This disables Submit button when the form has been submitted to
prevent consequent submissions before the page has been loaded.
WIRIS quizzes 3.28.6
submodules