Author: Paul Holden
MDL-80328 user: use modal confirmation for admin deleting users.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a32397feda27d670b2e33e7e68693a1d5d176c28
http://github.com/moodle/moodle/commit/a32397feda27d670b2e33e7e68693a1d5d176c28
+ 4.4 en [deleteduserx,core_admin]