qbank_managecategories - UI enhancement

Test scenario 1 Login into the Moodle site as an administrator Navigate to: Site home > Add new course Navigate to: Created course > Create a new Quiz Navigate to Quiz: Actions menu (Gear icon) > Question bank > Categories   Confirm: That you have 4 defaults categories, that they are not draggable. That you have an 'Edit' button for each (containing only "Edit settings" and "Export as Moodle XML")     Test scenario 2 Navigate to Site home > Created course > Created quiz > Actions menu (Gear icon) > Question bank > Categories > Add category   Choose a parent category Fill in a Name Fill in Category info Fill in an ID number Click Add category   Confirm: That the created category appears ander the proper chosen parent category. That the id number is displayed That you have an 'Edit' button for each (containing "Edit settings", "Export as Moodle XML" and "Delete" where more than one category is present)     Test scenario 3 Navigate to Site home > Created course > Created quiz > Actions menu (Gear icon) > Question bank > Categories Click "Show descriptions"   Confirm: That you see all descriptions displayed including the one you previously created.     Test scenario 4 Navigate to Site home > Created course > Created quiz > Actions menu (Gear icon) > Question bank > Categories   Confirm: That you can drag and drop categories in another context.     Test scenario 5 Navigate to Site home > Created course > Created quiz > Actions menu (Gear icon) > Question bank > Categories Create question(s) in one category.   Confirm: That you can use the "Edit" menu actions When editing and saving ("Edit settings"), confirm description, name, id number are properly updated. That deletion ("Delete") works, if category is full that deletion prompts the moving of questions before removal. That "Export as Moodle XML" works.