Push to history when the library mounts. Whenever popstate occurs after mounting, request to be closed.

Behavior captured in the `Modal` container. If we want to re-use this functionality for anything else that uses `ModalComponent`, just use the `Modal` container rather than `ModalComponent`.

Including action-menu which was also giving one when the backdrop library opened.
Localize the costume library, I missed it while doing the other libraries.

This reverts commit 321839ca.

With jscodeshift thank God

Remove MediaLibrary helper since it is now unused

The inline css method gives us nothing that CSS modules can't give us. This puts the project more in line with the way www works, and makes CSS actually readable.

Using class names gives us full control of the modal styles.