Hotfix: Add proxy to allow IE9 to make xdomain requests

Adds an /xdomain_proxy.html endpoint that serves
the proxy file from the xdomain library.  This
allows IE9 users to iframe in the proxy page
to simulate a cross-domain request with cookies.

Fixed static pages removed on import for split course.

PLAT-484

Fix code comment showing in rendered page

Update translations (autogenerated message)

View discussion of user profile return 404

Release

Override COURSE_*_VISIBILITY_PERMISSION from ENV_TOKENS

onload performance beacon for LMS pages

Fixed flaky test(s) - SOL-336 - merging updates

Consistently use display_name_with_default in Studio

update ORA2 to fix TNL-1758

Don't use the working tree as storage for test-created files.

Squashed and tests passed - merging.

Conflicts:
	common/lib/xmodule/xmodule/xml_module.py

Fix empty promise. It was always evaluating to true.

Clee/ma 169 ma 77

Release

MA-77 Automatically adds the course id to the videos in VAL
when a course is rerun.

Benp/add markdown tests

This addresses TNL-1808 (and likely other flaky tests
in this area).

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default discussion modules' discussion_id field to xblock's UNIQUE_FIELD...