MDL-42803 behat: Fix random behat errors in CI
MDL-41392 course: management accessibility tweaking
MDL-41392 course: management checkbox accessibility improvement
Merge branch 'MDL-42803-master' of git://github.com/ankitagarwal/moodle
MDL-42754 Messages: Fixed typo
Merge branch 'wip-mdl-42754' of https://github.com/rajeshtaneja/moodle
MDL-42774 JavaScript: Ensure that shifter cleans build directories before running