Developer credits
Git commits in Moodle 3.4.x 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