Developer credits
Git commits in Moodle 2.4.0 by David Penner
commit 7547a5a3d69a421f10430d78c70ca418d30956ef Author: David Penner <contributor@tracker.moodle.org> Date: Wed, 18 Jan 2012 11:19:27 +0800 Tag: v2.4.0-beta MDL-31160 block_navigation: Fixed incorrect thrid arg to substr.