LMS Acceptance to one shard.

Add cosmetic price field to studio & logic

- Price field added to Advanced Settings
- Function that decides which price to display
- Test added to check that the function outputs correct price
- Added feature flag and conditional to decide whether to display course price or not
- Feature Flag to show or hide course price on Course About page sidebar when not using shopping cart

Country access messaging theme fixup

Fixes broken answer and endorse icons on discussion forums

Revert "Add Cosmetic Display Price field to studio & logic to show it"

Move default country access messages out of static_templates, so they are not served by other Django views.

Fix a number of incorrect translation string uses.

These were found by the new pylint checker I wrote! :)

Add Cosmetic Display Price field to studio & logic to show it

Also cleaning up some lint.

This test consistently fails when combining
lms acceptance onto one shard. (TE-737)

We've transitioned many lettuce tests to bok-choy. It no longer
makes sense to keep LMS acceptance in two shards (each taking less
than 5 mins to run the actual tests).

ECOM-998: Country access messaging

Add new models to embargo to support country access

Use HTTP_X_FORWARDED_PROTO header in studio

disable PayAndVerifyTest.test_immediate_verification_enrollment

Add Django admin UI for configuring country access

Migrate existing embargo rules into the new tables.

Update translations (autogenerated message)

Introduce another bok-choy shard.

SOL-302 Hide reindex button if 'ENABLE_COURSEWARE_INDEX' false

Default search engine to None

TNL-1298: Flaky Jasmine test for Student Notes.

Accessibility fixes for UX-1572

don't add xblock with 'detached' tag as direct child of course for split...

PLAT-420

Three spelling fixes

I was going to make a more substantial change, but then realized why I
shouldn't.  Along the way, I saw these three words that should be
corrected.  So I was left with three very minor spelling fixes.  Should
I abandon them?  Seemed unfortunate.  So I'm committing them.

These are the kinds of decisions software engineers have to make....

ECOM-1018: Fix translator comments showing up in redeem code email.

adds Mark Sadecki to AUTHORS