Developer credits
Git commits in Moodle 3.3.x by Tobias Nießen
commit 4000d6e59da9047deff5ab662234b6dc294d7ba4 Author: Tobias Nießen <tniessen@tnie.de> Date: Sat, 25 Mar 2017 19:30:20 +0800 Tag: v3.3.0-beta MDL-56632 book: position of "Turn editing on/off"