LEARNER-1923

Moves ENABLE_ENTERPRISE_INTEGRATION to settings.FEATURES,
and changes the default value to False.

LEARNER-1854

EDUCATOR-341

LEARNER-1696

LEARNER-1112

Added course level lang attribute for LMS

added lang attribute to Studio

fixed error when trying to get language attribute on course that does not exist

simplified code

added lang attribure to more places in LMS, added migration for language attribute in course_overview

fixing contraints in the database for language attribute

added lang attribute to several more places in LMS and Studio

added lang attribute to discussion and custom pages; cleaned up code

fixed issue that was causing test failures

moved lang attribute higher in tree in two places

EDUCATOR-229

EDUCATOR-11

Pass proper 'this' context to updateSidebar method so that sidebar could resize properly on load, scroll.

LEARNER-76

LEARNER-394

Ensure Enterprise-integrated courses require user consent before granting access to Wiki and Discussion forum.

* User-facing links are gated; internal services are not.
* Adds view decorator data_sharing_consent_required
* Renames `get_course_specific_consent_url` to `get_enterprise_consent_url`,
  which now checks `consent_needed_for_course` before returning a consent URL.

TNL-6347

TNL-6117