MDL-41232 revert IE8 fix for solving unspoken filemanager details on View List selection
MDL-42300 course: improved category re-sort controls.

* The top action now works on top level categories and has
  a better title.
* Each category has its own resort actions now.
MDL-42629 course: improved wording on move course dialogue
MDL-42629 course: tweaks CSS for management interface

* Removed grey background from checkboxes and bulk actions.
* Removed blue colouring on subheadings.
* Changed greys to the clean theme greys
MDL-42629 course: renamed re-sort to sort
MDL-42629 course: fixed up create category management actions
MDL-42629 actionmenu: alt and title on icon removed if the same as text being displayed
MDL-42629 course: changed sub category to subcategory
MDL-42629 course: moving a course now updates counts and pagination totals
MDL-42629 course: changed new course to create new course
MDL-42629 course: set a better management page title