Both the instruction copy and the error feedback copy are changed to better help user understand the image restrictions
EDUCATOR-1954

Course-discovery is returning incorrect availability status of the
courses that have 'null' value in their course_end date.To avoid it,
a conditional statement is modified so that it will behave as expected.

LEARNER-3218

The previous program field named instructors caused confusion as it
wasn't obvious that it was only to be used to help determine which
order to list instructors. Renaming it to instructor_ordering helps
minimize confusion and better explains it's purpose.

[WL-1343]

EDUCATOR-1954

EDUCATOR-1957

EDUCATOR-1953

EDCUATOR-676

This allows the program creator to determine the order of the instructors on the program marketing page.

We need a new name/path for the new image updated to these objects because cache would keep the old image alive all the time
LEARNER-3455

EDUCATOR-1840

EDUCATOR-1818

programs formerly only calculated price ranges based on seats,
this commit changes price ranges to be calculated with the price
of entitlements for a course when available, and falls back to
the price of the seat for the course when no entitlement is present

LEARNER-3297

EDUCATOR-1818

We should filter out those publisher courses without the image stored in the object

Source the proper short description from Marketing Site course about pages into discovery service
LEARNER-3379

fixed tests

ignore topic model

fix pylint

fix lint

add tests

rename

updated translations

fix translations

add newline at end of file

fake translations

update migration

fix import

fix flaky test

EDUCATOR-1790

LEARNER-2935

EDUCATOR-676

EDUCATOR-1761