MDL-78528 course: Display all forms in default activity completion page
This commit displays all the module forms together in the default
activity completion page:
- The checkboxes have been removed. Now the activity names are
displayed as accordions.
- Module names have been changed from plural to singular.
- The activity completion form is displayed below each module name,
when the chevron icon is expanded. The cancel button is not displayed.
- The CSS has been updated to meet the prototype styling.