Upgrade help-tokens to 1.0.3

Upgrade django-crum to 0.7.2

Merge pull request #15532 from edx/mroytman/PLAT_1487_django_1.11_upgrade_edx-django-sites-extensions

upgrade edx-django-sites-extensions from 2.1.1 to 2.3.0

PLAT-1629 Retry abspath() failures

Dont fetch captions while fetching translations

fix styling issues in program details page

This fixes the endless loop of fetchCaptions ajax requests. fetchCaption on error calls fetchAvailableTranslations which again calls fetchCaption on success and so on. We don't see any significance for calling fetchCaption in fetchAvailableTranslations.

EDUCATOR-810 fix UnicodeDecodeError

Adding the capability to write reviews to the reviews page.

LEARNER-1628

This allows enrolled users to write reviews on the reviews page that
can be accessed through the course tools sidebar. A button in the top
corner of the page toggles the widget that is configured with a
setting in the common.py file. The reviews tool is Course Talk.

Implement course home redirect if user cannot enroll

Fix Studio context-sensitive help link to video documentation

Set ui_lang in Sailthru when creating and updating users

LEARNER-1696

EDUCATOR-565 | Add POLICY_CHANGE_GRADES_ROUTING_KEY, fix errors in compute_all_grades_for_course circuitry.

Remove unneeded mustache references.

EDUCATOR-341

WL-1079

RET: Cleanup Planning Prompts experimental code

upgrade edx-django-release-util to 0.3.1

Merge pull request #15522 from edx/adeel/LEARNER-1188_Setting_connection_timeout_value_for_sailthru_api_call

Increased timeout value for sailthru api call.

Upgrade version of milestones.

LEARNER-1186

[WIP] Add django management command to create course from json

Handle anonymous and unenrolled users on the new course home page

LEARNER-1696

Remove django-mako requirement

Add chromeless class to the wrapper when in chromeless mode.

Deprecate lettuce in testing.rst document

Don't allow any user to create courses by default

* Change settings default
* Set `ENABLE_CREATOR_GROUP` to False for devstack
* Set `ENABLE_CREATOR_GROUP` to False for tests

In f095c5fe it was decided to enable
anyone to make courses in Studio by default in order to make things
easier in dev environments. This was before the code was open source.
This default is likely in effect for many Open edX instances, but almost
no one would want this setting outside of development.