Update translations

This is step 1 of https://github.com/omab/python-social-auth/blob/master/MIGRATING_TO_SOCIAL.md#migrations

Revert "Upgraded edx-auth-backends to 1.0.2"

This reverts commit 7ddb62c0.

* Add soapbox acceptance test w/ management commands

* Fix linting errors

* Add test case for inactive soapbox message

* Add unit test for create/delete message utils

LEARNER-693

* Increase default cache timeout to 1 hour

* Only increase timeout for summaries.

Also sets local cache to a DummyCache.

* Revert local.py DummyCache setting

* Update api-client to 0.11.0

* Revert "Update api-client to 0.11.0"

This reverts commit e719968954b3b82c9eb0fe65cabcb8e501a633f6.

Accidentally committed to wrong branch.

Patch upgrade to django.

Update translations

Update translations

Update translations

* Prevent XSS attack in jQuery 2.X with ajaxSetup

* Add $ param to common function

Update documentation for Courses page to reflect enrollment cards

* Set tagName of course id/name column cells to th

* Add scope="row" to th cells. Fix learner roster.

* Fix JS tests

* Refactor common code into a RowHeaderCell class

* Fix the Course List initial default sort order

Courses without a name should be sorted to the end of the list to be consistent
with the behavior of the JS sorting.

* Fix unit test for course_summaries default sort

Update translations

* Upgrade backgrid to 0.3.8, headers are buttons

* Address PR comments

* CSS & HTML tweaks pending UX review

* Update translations

Add info about Courses page filtering and Course Summary report download

* Raise 404, not 500, if invalid course_id requested

* Remove unneeded try/except in CourseContextMixin

The Http404 will be raised by the middleware or by the CourseValidMixin before
it even starts executing that function.

* Revert adding try/except to format_course_key tag

* Move summary metrics to separate function

* Add summary metrics to index w/ acceptance tests

* Update translations

* Fix linting errors

* CSS tweaks and adjustments

* Fix course_index acceptance tests

* Address PR comments and refactor acceptance tests

* Less awkward cards header wording

* Update translations

Update translations

* Use new remove_keys util to remove cols from CSV

Removes created and enrollment_mode.*.count_change_7_days columns from the
course-list CSV. Includes unit test for remove_keys util function.

* Fix CSV test

* Add download csv button to course list page

Also, a11y fix: make visible results-num span aria-hidden so the text is not
read twice by a screen-reader.

* Add acceptance test for downloading csv

* Use non-deprecated karma gulp runner

* Update jasmine-core npm package

* Output node version before running tests

* Try updating all karma-related npm packages

* Update translations

* Add disabled/active sr text to pagination links

* Update translations

Pin backgrid to 0.3.7 (0.3.8 introduces a breaking change in Insights).