Author: Devang Gaur
MDL-54973 message: added messages to globalsearch
http://git.moodle.org/gw?p=moodle.git;a=commit;h=26c0d75f3e605ad982093761679050b3dbbb1ca0
http://github.com/moodle/moodle/commit/26c0d75f3e605ad982093761679050b3dbbb1ca0
+ 3.2 en [search:message_received,core_search]
+ 3.2 en [search:message_sent,core_search]