Andrea Fercia 7a414342df Accessibility: Improve the Theme Details modal accessibility.
- sets the modal content to `role="document"` to make screen readers switch back to browse mode
- standardizes the Themes screen and Customizer modals interaction
- Themes screen modal: sets initial focus on the modal overlay instead of the primary button, avoiding to "skip" content for keyboard and screen reader users

Fixes #42055.


git-svn-id: https://develop.svn.wordpress.org/trunk@41658 602fd350-edb4-49c9-b593-d223f7449a82
2017-10-01 13:47:29 +00:00
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