course_specific_reg/login for OpaqueKeys

Tweaks for i18n docs

Fix a bug in Individual Due Date Extensions (IDDE).

Remove LocMapperStore

LMS-2918

Add promise to ensure unit visibility is changed

Disable test that is leaving modal open.

Feanil/fix bokchoy

STUD-1963

Change answer <-> response matching in capa.get_submission_metadata

Make text on register button on About page conditional.

The IDDE implementation relied on a StudentModule being created for a
particular block in order to set the extended due date on that block.
Since StudentModules seem to be created on demand whenever data is
written to an attribute with Scope.user_state, it meant that if a
homework problem hadn't yet been touched by a student it was possible
that the due date extension wouldn't take effect for that problem, even
if the due date extension was successfully set for the parent unit.

This patch fixes this problem by creating new StudentModules as
necessary in order to make sure extended due dates propogate properly to
all problems in a unit.

 Added a new advanced setting; invitation_only

 If invitation_only display "Enrollment in this course is by invitation only"
 Otherwise, if outside of enrollment period display "Enrollment is Closed"

 This issue is logged at LMS-2670

 Also fixed in this PR is issue LMS-2717; even though the Register button was greyed out,
 clicking it sent one to the registration page.

New chapter on discussion features for all users

There is a bootstrapping case where the test DB doesn't exist which causes reset_db to fail.

Fix calls to get_module to not pass course ids as positions

Fix pending name changes template

Add JQuery timepicker CSS to the unit and container templates

Update (optional) Group Configuration urls to use settings.COURSE_KEY_PATTERN

Create new group configurations page

- Strings marked for translation need to be wrapped in quotes to be
string type.
- Update old post function call
- Remove extra close brackets in function definitions
- Wrap href attribute in quotes
- Move square bracket outside of translated text

Implement close_connections and drop_database on modulestores.

Add "visible_to_staff_only" field to support staff locking in Studio.

STUD-1875

Update opaque-keys library

auto-migrate old mongo to draft modulestore

Adding django default log handlers into logging configuration

Refactor split migrator