…penedx#968)

To enable grouping by subsection in the discussions MFE, this PR updates
the embed URL to the one that supports grouping.

ref: openedx/frontend-app-discussions#281

Translates the rectangles for current and passing
grades when to appear on the right when in RTL.

Allows frontend-app-learning to be configured at
runtime using the LMS's new MFE Configuration API.

Part of openedx/wg-frontend#103

Currently expiring soon is displayed 28 days before expiration
and forever afterwards. Adds an actual expired state for after.

Also clarifies the expring soon message which assumed other course,
that was not necessarily true.

Also updates the take action lines when you do not have valid
onboarding to make sure they appear for everything not currently valid
or in process, and updates the submitted process lines to not appear
for expired statuses.

Mirrors the background image used in the new user tour modal
as it obstructs the readability of the modal title when in RTL