This is a work in progress finished the 320px - 539px mobile
screen design.

LEARNER-2311

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

LEARNER-1115

This feature is not always needed and is not properly provisioned for devstacks.

Pulling URLs from settings allows us to rely on site configuration overrides in order to support multi-tenancy.

LEARNER-1103

This service is not currently available in Docker devstack.

This reverts commit 65f13dde.

This reverts commit 88dd85ca, reversing
changes made to bf8aef33.

This modifies the lang-pref django app to:
a) Use the current value of the 'edx-language-preference' cookie to set the
   users Accept-Language header on an incoming request.
b) At the end of the request, update the 'edx-language-preference' cookie
   to reflect the users current Language Preference choice, if any.

[LEARNER-542]

- Fixed LMS_ROOT_URL
- Fixed Enterprise API URL

These changes help simplify integrating with edx.org's separate marketing site.

ECOM-6627

This feature is not well-documented, so it is unclear how to setup Elasticsearch properly to make it work. The next person who needs to work on this feature will need to make it work and, ideally, document it.

ECOM-7099

ECOM-6634

ECOM-6634

ECOM-6634