Developer credits
Git commits in Moodle 3.3.x by Helson Castro
commit 5ad0bb82f177aed7f2fb909d5a0c6c5b078f36c9 Author: Helson Castro <helsonaraujo@hotmail.com> Date: Fri, 27 Jan 2017 13:55:07 +0800 Tag: v3.3.0-beta MDL-57568 forms: Added missing include for button element.