Author: Amaia Anabitarte
MDL-64495 admin: New Messaging settings category in Site administration
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a029ee00cd9c34fb08aa33791e6045d2e728e52e
http://github.com/moodle/moodle/commit/a029ee00cd9c34fb08aa33791e6045d2e728e52e
+ 3.7 en [messagingcategory,core_admin]
+ 3.7 en [messagingssettings,core_admin]
+ 3.7 en [defaultmessageoutputs,core_message]
+ 3.7 en [managemessageoutputs,core_message]
+ 3.7 en [messageoutputs,core_message]
+ 3.7 en [type_message,core_plugin]
+ 3.7 en [type_message_plural,core_plugin]