Author: Sara Arjona
MDL-63692 core_message: Add conversation support to Privacy API
http://git.moodle.org/gw?p=moodle.git;a=commit;h=201cebeae5891711b11554bd9816187327986475
http://github.com/moodle/moodle/commit/201cebeae5891711b11554bd9816187327986475
+ 3.6 en [privacy:export:conversationprefix,core_message]