Andrea Fercia 88c7224355 Accessibility: Add Themes Feature Filter form improvements.
- adds "Apply Filters" and "Clear" at the end of the form
- changes the "Feature Filter", "Apply Filters", "Clear", and "Edit" links in `<button>` elements
- removes a leftover from [27963]
- clarifies one button text and adds an `aria-label` attribute
- adds a `wp.a11y.speak()` message when clicking on "Apply Filters" and no features are selected

Fixes #38086.

Built from https://develop.svn.wordpress.org/trunk@38640


git-svn-id: http://core.svn.wordpress.org/trunk@38583 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-09-21 17:54:28 +00:00
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2016-07-26 23:24:28 +00:00