Author: Shamim Rezaie
MDL-67899 message: Add aria-label to the emoji picker button
http://git.moodle.org/gw?p=moodle.git;a=commit;h=cd4c44bea47172e4d59c0d44c23e649a41ee5a90
http://github.com/moodle/moodle/commit/cd4c44bea47172e4d59c0d44c23e649a41ee5a90
+ 3.9 en [toggleemojipicker,core]