Fix typo and add more text to the error shown when 'wpdialogs' is not enqueued. Add 'wp_enqueue_editor' action fired when scripts and styles for the editor are being enqueued, fixes #16284
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Theme Installer: Handle currently installed themes, add search route, let prev/next refresh collections.

props matveb.
see #27055. fixes #27695.

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Improve hook docs for the `wp_enqueue_editor` hook, added in 3.9.

See #16284, #27700.

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git-svn-id: http://core.svn.wordpress.org/trunk@27856 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE help modal:
- Don't load the old tiny_mce_popup.js.
- Add the shortcut for <code> and the second shortcut for link to the shortcuts listing.
- Update some of the text.
See #27100
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TinyMCE help: Break up strings changed in [28027] for ease of changing later.

Restores a not inaccurate paragraph to reduce churn.

see #27100.

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git-svn-id: http://core.svn.wordpress.org/trunk@27858 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Expose toolbar keyboard shortcut in Help documentation for TinyMCE.

props joedolson, jorbin.
fixes #27024.

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Header Images: Add suggested dimensions to the media workflow.

props ehg, gcorne.
see #21785.

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Header Images: Add suggested dimensions to the media workflow.

This updates [28030] to the latest patch.

props gcorne.
see #21785.

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