Remove autoplay for video in course about page

The iframe was generated with autoplay=1, which, sometimes, would cause
the video to play in the background.
Translate gender and education level from user profile
Catch exception if for en no default subs is uploaded.
updating commit
Correct misaligned django-cas integration
Add translator comments for 'other' and 'none' strings
Make forum comment buttons activate by keyboard

Neither edit nor delete activated on pressing the space key.
making LMS modal buttons more flexible to handle longer strings in translation, eg. French
Merge pull request #2805 from edx/gprice/comment-edit-button-key-activation

Make forum comment buttons activate by keyboard
Merge pull request #2806 from edx/frances/fix/lms-modal-button

making LMS modal buttons more flexible to handle longer strings in trans...
Create coverage reports for bok choy tests in Jenkins
Merge pull request #2809 from edx/zoldak/bok-choy-coverage

Create coverage reports for bok choy tests in Jenkins
Merge pull request #2804 from edx/jarv/update-jsdraw-commit

updating commit
Support xblocks with children on the container page.

STUD-1363
Merge pull request #2802 from ionis-education-group/gender-education-translation

Translate gender and education level from user profile
Merge pull request #2796 from edx/alex/no_default_subs_en

Catch exception if for en no default subs is uploaded.
Merge pull request #2517 from ionis-education-group/remove-video-autoplay

Remove autoplay for video in course about page
updating commit
Merge pull request #2817 from edx/jarv/update-js-draw-commit

updating commit
Allow HTML in grader messages.