Developer credits
Git commits in Moodle 1.9.18 by David Mudrak
commit 516878be1ec8696e26668b54ada1335fa0f666b1 Author: David Mudrak <david@moodle.com> Date: Fri, 06 Apr 2012 17:22:18 +0800 Tag: v1.9.18 MDL-24403 Fixing the print_error() calls to use the existing string