Wiki edit page labels incorrectly used

Issue
Inappropriate use of label on submit button (considered an orphan label).

Standard Level
WCAG 2 1.1.1 (A) http://www.w3.org/WAI/WCAG20/quickref/#qr-text-equiv-all

Impact
Serious

Example Link
http://demo.moodle.net/mod/wiki/edit.php?pageid=56

Test Steps

1. Login as teacher
2. Navigate to demo science course
3. Click on wiki if it has been created
4. Edit page
5. View the fgrouplabel div tag above the save button and it will have an empty label tag