Notification of string changes

Author: meirzamoodle
MDL-64148 core: Make email greetings consistent
Some email body strings use first names as greetings,
some use full names, and some do not.

Using the first name for greeting makes it consistent and
a bit more "personal".


http://git.moodle.org/gw?p=moodle.git;a=commit;h=699daafc64a17ab44d2c711446d4284eab69da8b
http://github.com/moodle/moodle/commit/699daafc64a17ab44d2c711446d4284eab69da8b

+ 4.5 en [lockoutemailbody,core_admin]
+ 4.5 en [emailupdatemessage,core_auth]
+ 4.5 en [customwelcomemessageplaceholder,core_enrol]
+ 4.5 en [emailconfirmation,core]