Author: Jun Pataleta
MDL-52661 gradingform_gudie: Accessibility fixes for marking guide
http://git.moodle.org/gw?p=moodle.git;a=commit;h=fb43a326c2dcdef8433edc4f0fa2f452d1958584
http://github.com/moodle/moodle/commit/fb43a326c2dcdef8433edc4f0fa2f452d1958584
+ 3.1 en [comment,gradingform_guide]
+ 3.1 en [criterion,gradingform_guide]
+ 3.1 en [criterionremark,gradingform_guide]
+ 3.1 en [guide,gradingform_guide]
+ 3.1 en [insertcomment,gradingform_guide]