mattdrayer/SOL-952: Update default URLs and add backwards migration

Allow released languages to be previewed under dark lang

Profile Images API doc

Clytwynec/rebalance bokchoy shards

[LTI Provider] Fix bug preventing unenrolled users from accessing content

lliu - linda adding name to authors file

ECOM-1572 implementing code to new branch.

Use dicts when defining JSON

Credit provider integration Python API (Part 1 of 3)

Fix flaky lettuce test. TE-572.

Adding information about paver

Fixed cms course export using management command.

Web Certificates: Add Base/Distinguished Print Styling - Take 3

This should be ported to bok-choy, but until then we should fix the flakiness in
this test. It needs to wait for the page to change after the user clicks 'reset'.

Use parent_id returned from the comments service

unskip acid xblock tests

ECOM-1644 Implementing course-access roles.

refactored code to make certificate PDF generation optional

pause_video event does not emit when a video ends

Fixed cms course export

Change https://github.com/edx/edx-platform/pull/8240 refactored the LTI
provider template rendering code and introduced an issue where a user was
required to be enrolled in a course before that course's content could be
accessed over LTI. According to the LTI design spec:
    https://docs.google.com/document/d/185hdPvIxcKtiDOLjb4sTGovA_WYXWz5Cd79gCzQwBms
we delegate access control over LTI content to the LTI consumer, rather
than requiring that users enroll in edX courses explicitly (and that admins
keep edX and LTI provider enrollemnts consistent when students add or drop
courses).

This change fixes the immediate issue, which is disrupting the LTI Provider
pilot currently running at Harvard.

Tweaked names of badge events.

This depends on cs_comments_service commit 0487891.

MA-661: Clee/discussion api delete thread

TNL-1891 Browse Teams: Category Subnavigation

Reducing size of error message heading

Refactor and merge CourseViewType and CourseTab.

Improve README for openedx directory