Author: Jason Fowler
MDL-35832 - Accessibility - Adding more precise context sensitive title text to undock controls on docked blocks
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b9271ffd94d7198bc6ce2d5b413b5feee403f866
http://github.com/moodle/moodle/commit/b9271ffd94d7198bc6ce2d5b413b5feee403f866
+ 2.5 en [undockblock,core_block]