Fix n-click behaviour on poster.
Fix unit tests.
Fix handler for non_en lang for bumper.
Add more tests.
Fix docstrings.
Fix pep8.
Fix static redirection with bumper.
Fix button in IE11.
Add video_bumper field in bok_choy.

Fix pylink violations.

Update docstrings and some clean up.

Rename edx_video_id in bumper tests.

Fix too long lines in help text.

Address ui comments.

Fix bumper events.

Refactor bumper-transcripts code, fix bugs, address comments.
Squashed commits:
Fix download transcript button.
[74e0c8c] Fix quality
[a759f33] Fix error, when sub contains extension.
[b30755c] Revert "Add video files to host for transcripts."

This reverts commit cf8a96bf84346e17b6ad57ad4cc6a27d7a9118cd.
[36f038a] Add video files to host for transcripts.
[23f1655] Fix pep8 and pyling issues.
[0f1f9d2] Update acceptance test.
[765a27d] Wait for ajax in captions.
[8ae72a3] Fix logic.
[063450f] Fix unit tests.
[d1075fc] Fix handlers tests.
[25d31ad] Update bumper_utils.
[cb5f9df] Remove maxDiff.
[8738b1a] Code cleanup.
[87dbcb7] Fix issues with transcripts.
[ec899de] Fix transcripts in serializers.
[444b1fc] Fix transcripts typo.
[d524cb5] Fix bumper.
[f62cf22] Fix video mongo tests.
[8f1b55a] Fix dispatches.
[53bc308] Add more fixes.
[d5e3723] Fix test_video_handlers and rename the method.
[93efc23] Fix mobile tests.
[740e2ae] Fix pep8 and pylint.
[47cfb66] Address comments, add fixes.
[4e499d9] Add fixes.
[8353553] Add improvements.

Updated dispatch values)
.

Use ddt in bumper handler tests.

Move common metadata to single place.

Fix style.

Update docstring.

Fix poster button.

Improve bumper events.

Fix test after rebase.

Address comments.

Download transcript: use def video lang, not bump.

Renamed date_last_view_bumper to bumper_last_view_date.

Rename do_not_show_again_bumper to bumper_...

Address comments.

Fix tests for download for en lang.

Fix bumper logic.

Update strings.

Update resizer.

Remove resizer.

Fix unit tests.

Add tests.

Fix bumper events.

Clean up tests.

Fix pylint violations.

Fix pep8 and pylint violations.

Update docs and method names.

Update events.

Make /static/ prefix a must.

Fix wrong code.

This allows course authors to choose between two difference licenses for their
course content: All Rights Reserved, or Creative Commons. In the backend, XBlocks
that wish to allow custom licenses need only inherit from LicenseMixin, which
adds a `license` field as a string.

License information is displayed in the Studio editor view, and just below the
rendered XBlock in the LMS. In addition, if the course block itself has a custom
license set, this license will display just below the main body of the page
on courseware pages.

This entire feature is gated behind the LICENSING feature flag.

This is required so that an a video module exported by one Open edX
deployment and imported by another will work correctly if it contains an
edx_video_id but does not populate other URL fields.

JIRA: MA-110

The overall behavior of the __init__ method has remained the same.
What's changed is how it determines whether a field is explicitly set.

Instead of using the slower performing editable_metadata_fields, it
calls _field_data.has directly to check for explicitly set fields.

This feature allows upload of video assets to S3. This requires that the
VIDEO_UPLOAD_PIPELINE setting be properly configured and that each
course be configured with a token issued by the media team for their
processing purposes (e.g. linking the video with a YouTube channel).

Co-authored-by: Greg Price <gprice@edx.org>

Note that the features in this release are opt-in, and course and video
behavior will remain the same unless a course explicitly opts in.

Major pieces of functionality with this commit:

Allows the listing of a user's enrollments, course videos, and updates. In
order to make a course available for mobile use, course staff must explicitly
set the Course Advanced Setting "Mobile Course Available" to true. Course staff
will always see their own courses through the Mobile API regardless of this
setting, but students will only be allowed to see a course through the Mobile
API if this setting is set to "true". By default, a Course will *not* be
available for mobile use.

This is a Django app for video resource management. It is completely optional,
and is intended to allow video and operations teams to create new encodings of
videos (e.g. low res for mobile) and change CDNs without having to edit course
data directly. Course teams can now use a "EdX Video ID" setting for Videos,
which will leverage VAL. Video units that do not fill in an "EdX Video ID" will
behave exactly as they always have.

* The Mobile API is enabled with the ENABLE_MOBILE_REST_API feature flag.
* VAL is enabled with the ENABLE_VIDEO_ABSTRACTION_LAYER_API feature flag.
* VAL and the Mobile API both require ENABLE_OAUTH2_PROVIDER).
* The Mobile API is a read-only API, but VAL requires database migrations.
* Applications that make use of either the Mobile API or VAL must be registered
  with the OAuth2 provider app in Django Admin.

TNL-324

[LMS-2757]

This commit updates lms/djangoapps/courseware.

These keys are now objects with a limited interface, and the particular
internal representation is managed by the data storage layer (the
modulestore).

For the LMS, there should be no outward-facing changes to the system.
The keys are, for now, a change to internal representation only. For
Studio, the new serialized form of the keys is used in urls, to allow
for further migration in the future.

Co-Author: Andy Armstrong <andya@edx.org>
Co-Author: Christina Roberts <christina@edx.org>
Co-Author: David Baumgold <db@edx.org>
Co-Author: Diana Huang <dkh@edx.org>
Co-Author: Don Mitchell <dmitchell@edx.org>
Co-Author: Julia Hansbrough <julia@edx.org>
Co-Author: Nimisha Asthagiri <nasthagiri@edx.org>
Co-Author: Sarina Canelake <sarina@edx.org>

[LMS-2370]

This reverts commit b4ba04ba.

This reverts commit 1ed167d9.

Fix donwload subs for non youtube videos and non-en language - continue.
Add acceptance tests.
Add detetion of assets on request.
Updated docstring.
Add fixes and acceptance tests.
Fix acceptance tests.
Update docsrtings and cleanup code, resful for language_id.
Specify exception type in POST.
Fix url in upload module.
Improve exception handling.
Remove 'en' and catching in editable_metadata.
Move descriptor.get_context test to lms tests.
Add query parameter to translation dispatch.
Response to format parameter of translatin GET request.
Fix Acceprance test: Metadata Editor.
move handlers to proper scores.
Split video player into smaller files.
Add ugettext and fix typoes.
Add changelog.
Support for downloading non-ascii filenames.
Change event binding.
Add content-language to download requests.
Reractor POST handler to not update self.transcripts.

All YouTube urls are defined on backend side.

Check for status in test.
Add test for track url.
Fix test to use cookie.
Use download_track in feature file.
Add new tests for get_transcript.
Add html5 test.
Add content check.
Add tests for available_translations dispatch.
Disable flaky cms test.
Add  w/o english transcript tests.
Add to changelog.

Fix case where both old and new transcripts are uploaded, but transcript language isn't one of the new transcripts.