Added five more events with descriptions frm Blades
Youtube OR html5 made consistent
Added change log entry for PR3728
create draft request gets already created version if it exists
STUD-1616
update _xmodule_recurse to ignore some exception
update _xmodule_recurse method
Anton's and Sylvia's edits
Fixed register button on edge homepage.
LMS-2719
Merge pull request #3774 from edx/waheed/lms2719-fix-register-on-edge

Fixed register button on edge homepage.
Anton's edit, date change
Merge pull request #3766 from edx/zub/bugfix/std1616-editdraft

create draft request gets already created version if it exists
Disable cms test due to failure on master build.
fixing drag and drop
support aria-grabbed and aria-dropeffect
i18n: Make checklists translatable

Now the description & action_text strings in checklists can be extracted and translated.
Reorganized, updated, & streamlined sections in Running Your Course
Merge pull request #3818 from edx/ahodges/documentation/DOC368

Ahodges/documentation/doc368
Addressed review feedback.
Adaptive hint correct_answer must be lc
Merge pull request #3798 from edx/ahodges/documentation/DOC402

Adaptive hint correct_answer must be lc