Andrea Fercia 8f69ebf812 Accessibility: Improve the semantics of "tabs" that are not real ARIA tabs. ...

Some "visual tabs" in the WordPress admin used links wrapped in a `h2` heading. While these tabs look like ARIA tabs, they're just navigation menus and should be marked-up as such to be correctly exposed to assistive technologies.
- changes the wrapping `<h2>` to a `<nav>` element: worth reminding `<nav>` elements also define ARIA landmarks
- adds an `aria-label` to the `<nav>` elements so they can be distinguished from other `<nav>` elements in the page
- adjusts the headings level in the Credits page

Props audrasjb, afercia.
Fixes #43398.

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git-svn-id: http://core.svn.wordpress.org/trunk@44736 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2019-03-15 14:54:52 +00:00

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