Author: Meirza
MDL-76116 mnet: styling the delete key confirmation window properly
http://git.moodle.org/gw?p=moodle.git;a=commit;h=fd89171c9121c96df647d2e25b32e880afbe42f8
http://github.com/moodle/moodle/commit/fd89171c9121c96df647d2e25b32e880afbe42f8
+ 4.0 en [keydeletedcancelled,core_mnet]