Studio support for creating and editing libraries (PR 6046)

[antoviaque]

Duplicates https://github.com/edx/edx-platform/pull/6046 to allow Marco to review without spamming the reviewers on the original PR.

[marcotuts]

We don't use id based selectors, and are also removing all pure element selectors with an upcoming sass cleanup, so it would be good to replace this and any other id/element based selectors from this diff.

[marcotuts]

Thanks @antoviaque for creating this pull request. @frrrances will be reviewing this from a FED standpoint, and it would also be great to have a review from @cptvitamin for input from an a11y perspective.

This PR has already merged to master due to dependencies on a number of other follow-on pull requests. The hope is that with this PR we can still get a chance to track and eventually resolve any FED and A11Y concerns/improvements.

Thanks all!

[catong]

Users are not likely to be changing their organization name. Suggest changing the 2nd sentence to: "Change your library code so that it is unique within your organization."

[mtyaka]

The error message was copied from the courses (https://github.com/edx/edx-platform/blob/16809ddf1c32b04dc892e177b486bc63344e4824/cms/djangoapps/contentstore/views/course.py#L576-L579). If we change it for the libraries it would probably make sense to change it for courses, too.

[frrrances]

A few small changes. Once those are addressed, 👍 (even though it's already merged...)

[antoviaque]

@marcotuts @frrrances @catong FYI the comments made in the current PR will be addressed in https://github.com/edx/edx-platform/pull/6388 (SOL-80) -- most of your comments above are already implemented there.

Closing the current PR - if you have any additional comment, you can post them in https://github.com/edx/edx-platform/pull/6388 , we'll address them as part of the review there.

[mtyaka]

@catong @marcotuts @frrrances Please take a look at https://github.com/edx/edx-platform/pull/6388 (SOL-80), most of your comments have been addressed there.