Git commits in Moodle 3.4.0 by Marcus Green

commit 78af4ba0532eed2866e2223eb1baead860862d93
Author: Marcus Green <marcus@moodle.com>
Date:   Wed, 07 Jun 2017 21:53:53 +0800
Tag:    v3.4.0-beta

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