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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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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Nuke the TinyMCE help dialog as it is duplicated by help tabs. This leaves just Keyboard Shortcuts.

fixes #27100.

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Theme Installer: Disable prev/next buttons on first/last themes, add Esc handling, use IDs.

props adamsilverstein, DH-Shredder.
fixes #27521.

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Widget Customizer: Fix incorrect replacement in [27995].

props westonruter.
fixes #27690.

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git-svn-id: http://core.svn.wordpress.org/trunk@27864 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Installer: Use 'browse' instead of 'sort' for routes.

see #27055.

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git-svn-id: http://core.svn.wordpress.org/trunk@27865 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Installer: Left/right arrow keys in the overlay.

props adamsilverstein.
see #27521.

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git-svn-id: http://core.svn.wordpress.org/trunk@27866 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Installer: Combine 'Layout' and 'Columns' filters so 'Features' can span two columns.

see #27055.

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git-svn-id: http://core.svn.wordpress.org/trunk@27867 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Installer: Show 'Preview' button for installed themes.

props adamsilverstein.
see #27055, see #27708.

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git-svn-id: http://core.svn.wordpress.org/trunk@27868 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Templates: More escaping rather than interpolation. see #21785.

Built from https://develop.svn.wordpress.org/trunk@28039


git-svn-id: http://core.svn.wordpress.org/trunk@27869 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-admin/includes/class-wp-upgrader-skins.php.

Fixes #27711.

Built from https://develop.svn.wordpress.org/trunk@28040


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