Author: Andrew Nicols
MDL-71963 Core: Convert block deletion to a modal
Co-authored-by: Mathew May <mathewm@hotmail.co.nz>
http://git.moodle.org/gw?p=moodle.git;a=commit;h=529c5c2ece110e2dc7b2b842dbe4f41e9c08c018
http://github.com/moodle/moodle/commit/529c5c2ece110e2dc7b2b842dbe4f41e9c08c018
+ 4.0 en [deletecheck_modal,core_block]