Tests for the commit_on_success_with_read_committed decorator.

TNL-367
commit_on_success_with_read_committed should only work with atmost
1 level of transactions.

TNL-367
Added commit_on_success_with_read_committed decorator to views
which raise IntegrityErrors.

TNL-367
Merge pull request #5454 from edx/sanchez/fix-login-button

Tweak to old header styles to fix login button
Merge pull request #5407 from edx/cohort-management

Cohorts UI
Kill DISABLE_RESET_EMAIL_TEST flag

We're better served by just directly testing if we're in the LMS or not.
Merge pull request #5403 from mlkwaqas/waqas/tnl90-ordering-of-pinned-thread-ignored

Pinned thread should come first when sorting
Student-facing documentation v1
Merge pull request #5311 from edx/sylvia/docs/SFD

Sylvia/docs/sfd
Translate strings in LMS Underscore templates
Merge pull request #5265 from edx/zoldak/fix-test

Increase randomness of course name in testcase
Quiet stevedore.extension logging in bok-choy tests
Merge pull request #5392 from cpennington/escape-course-ids-in-html

Properly escape CourseKeys and UsageKeys in html templates
Merge pull request #5461 from edx/release

Release
Merge pull request #5458 from edx/andya/lms-underscore-i18n

Translate strings in LMS Underscore templates
Merge pull request #5457 from edx/kill-DISABLE_RESET_EMAIL_TEST-flag

Kill DISABLE_RESET_EMAIL_TEST flag
Don't put all of xmodule_js as src (changes coverage metrics).
Four Unicode fixes in discussion
Add new enrollment message to the dashboard

The body of the enrollment message template

Tokenize platform name in message.

Changing to a datetime enrollment approach

Adding sorting. A little refactoring.

Adding confguration model for time delta

Adding admin registration and basic form for new config model.

Fixing docstring typo

Updating default time delta to 0, adding test to show it disabled functionality.

Removing the form from configuration and tweaking the enrollment message html
Merge pull request #5424 from edx/adam/change-discussion-blackout-wording

update discussion blackout setting warning (TNL-442)