Author: Aparup Banerjee
MDL-30542 simple string improvement.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=675e402a552b4079a8ef68250b0656b307fd6c90
http://github.com/moodle/moodle/commit/675e402a552b4079a8ef68250b0656b307fd6c90
+ 2.3 en [servicenotavailable,core_webservice]