Author: Juan Leyva
MDL-60680 notifications: Support privacy API
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a129ba04c4a31510b6faa19809aa0315aff37b43
http://github.com/moodle/moodle/commit/a129ba04c4a31510b6faa19809aa0315aff37b43
+ 3.7 en [privacy:metadata:messages:customdata,core_message]
+ 3.7 en [privacy:metadata:notifications:customdata,core_message]