Git commits in Moodle 3.2.4 by Marcus Green

commit a9ba1423263667a96a5ecfdfd9650cdc221bb0c4
Author: Marcus Green <marcus@moodle.com>
Date:   Wed, 07 Jun 2017 21:53:53 +0800
Tag:    v3.2.4

MDL-58248 theme_boost: label/span for sidepanel expand button