- hide optional fields by default.
- instructions only shown when focused in.
- removed header
- Terms of service link and checkbox on same line.

In Django 1.10+, the set_language view (/i18n/setlang) will respond to
Ajax requests which do not contain a "next" parameter with status 204 No
Content instead of 304.  This commit adds the "next" parameter to the
request in order to ensure that upgrading to Django 1.10+ will not cause
the set_language view to change behavior.

PLAT-1353

LEARNER-2026

LEARNER-2026

- Convert hero events to BI events.
- Upgrade click event clean-up

LEARNER-2026

TNL-6381 added an upgrade upsell to course info. In PR #15265, this was
partially removed/moved, but some clean-up work remained.

LEARNER-2026

[LEARNER-2291]

LEARNER-1859

Added fields to add social links to the user account settings file.
Added icons to the user profile when these links are set, only shown
when users show their entire profile. Added jasmine tests for account
settings and learner profile pages. Added python unit tests to test
validation on the user account.

Only show course sock to English readers.

This reverts commit e2ee48c3.

LEARNER-1858

This reverts commit 441bccf4.

LEARNER-1510

Learners can upgrade or enroll as verified in all remaining courses in a program from their programs dashboard

[LEARNER-1899]

Input forms that need validation will have AJAX requests
performed to get validation decisions live.

All but a few important and common form fields perform
generic validation; these will need a back-end handler
in the future in order to have them validated through AJAX requests.

Information is conveyed on focus and blur for both
errors and successes.

LEARNER-1855

Store user's preference indefinitely.

EDUCATOR-229

Defaults to SUPPORT_SITE_LINK intentionally.
Also fixed surrounding quality tests, and overall
quality improvements.

The new design for the program detail page introduced a sidebar which includes a program-specific listing of credentials. This is an improvement over the old list of credentials found on the program list page and is meant to replace it. The new detail page is stable, so the credential listing on the program list page can be removed.

LEARNER-492

Course runs indicated to be upcoming are also restricted to those runs that are published.

LEARNER-942

LEARNER-1040 Only show congratulations message on the program details page once the program certificate has been earned.

Learners should be able to enroll in future runs of courses in which they have an expired enrollment. Previously, the course card model populated itself by selecting the first course run in which the user was enrolled. When the user tried to enroll in another run, nothing would happen because they were already enrolled in the run the page was trying to enroll them in.

Instead of blindly choosing the first run in which the user is enrolled, we now fall through to the same behavior we use for courses in which the user is not enrolled when the user has expired enrollments.

LEARNER-933

The new page is released and stable. The switch and old code are no longer necessary.

ECOM-7482

This reverts commit 55268dec.