Fixed grading tests

STUD-726

Cleaned up files with muliline imports

Cleaned up files that do not use these imports

Misread comment

Better error message

Made the statement better

pylint fix

Accidently left off parameter

Removed logout

- Internationalize upload errors.
- Move upload tests into their own files.
- Refactor upload dialog acceptance tests.

Removed set traces

Fixed display-name bug and added in a function to trigger events on firefox as well as check if it is firefox

put a 4th field in the create new course form where the user must specify a course_run. Also update unit tests to also provide this 4th parameter. Styling changes to better lay out the form fields are still TBD.

Instead, we use XModule field default values when creating an empty
XModule. Driven by this use case, we also allow for XModules to be
created in memory without being persisted to the database at all. This
necessitates a change to the Modulestore api, replacing clone_item with
create_draft and save_xmodule.