Studio support for creating and editing libraries (PR 6046)

Duplicates https://github.com/edx/edx-platform/pull/6046 to allow Marco to review without spamming the reviewers on the original PR.
"This" without a noun following can be problematic for translation. Suggest rewording:
"The name of the organization sponsoring the library. The name becomes part of the library URL, so no spaces or special characters are allowed. After you create your library, you cannot change the organization name."