Developer credits
Git commits in Moodle 3.3.0 by Philipp Hager
commit 29df1cade1c0abf69bd3f589fde77a18994023d9 Author: Philipp Hager <office@phager.at> Date: Wed, 30 Nov 2016 00:59:15 +0800 Tag: v3.3.0-beta MDL-57198 course: add css-classes to restrictbygroup-button