Notification of string changes

Author: Helen Foster
MDL-17678 typo fix thanks to reporter Chardelle Busch


http://git.moodle.org/gw?p=moodle.git;a=commit;h=a6dca3144c5f18ecf4a3db464ae5d004506af760
http://github.com/moodle/moodle/commit/a6dca3144c5f18ecf4a3db464ae5d004506af760

+ 2.0 en [configenablegroupmembersonly,core_admin]