Git commits in Moodle 3.2.x by Clement Smith

commit 126a4bc47bac509c45fbd2e57b5f5da08cfbdc65
Author: Clement Smith <cdsmith@umn.edu>
Date:   Wed, 01 Jun 2016 03:05:44 +0800
Tag:    v3.2.0-beta

MDL-50824 message/externallib.php: Fix get_string call