Video: Fix flaky acceptance tests.

Added template for iFrames. [BLD-611]

Fix Studio's XBlock dependency loading issues

STUD-1465

Changed the XBlock rendering logic to use promises to track asynchronous tasks.
Each dependency is then only loaded once the previous one has completed, and the
XBlock initialization only happens once all dependencies are loaded. This gives
XBlocks the same semantics in Studio as they get when shown directly on a page.

Display error page templates, for testing purposes

This commit allows us to test the server error template by visiting `/500`. This
way, we can catch errors in our error templates, instead of having infinitely
recursing errors.

Added ENABLE_MKTG_SITE to Features

Concept XBlock prototype

Test environment taking a little longer than expect. Jarv said okay to merge, so merging, 

Update translations (autogenerated message)

Install new ORA (edx-tim)

Fix typo in studio's email text

Support for displaying submissions API scores in Progress page.

Clean up references to answer distribution-like things

The right parenthesis should be appeared before the method '.format', not after.

Remove duplicate code in transcripts_ajax.

remove course location from loc_mapper on delete

In the near future an answer distribution report will be displayed in the data download reports table.  In order to avoid confusion, we need to clean up several misleading labels and remove a redundant feature.

Note that the redundant feature is surrounded by a feature flag so that it can be disabled once the report goes live in the table.

Fixes: AN-694

fix typo in data download tab (LMS-2441)

Fixes BLD-948 by escaping messages from xqueue, preventing malformed

html from getting onto the page. The client will then unescape the html
and display it.

More helpful UX in beta membership widget

032414 Language update

Moved all YouTube related URLs to a separate namespace.

All YouTube urls are defined on backend side.

Fix typo in transcripts_utils.

LMS-2262

Add a loading indicator to the Files & Uploads page.

Upgrade TinyMCE and switch to CodeMirror plugin

Unicode strings for server error page