Restore "Search Engines Discouraged" to the dashboard.

props JustinSainton.
fixes #26431.

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git-svn-id: http://core.svn.wordpress.org/trunk@26590 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix z-indexes as it relates to thickbox, the theme modal, and admin menu.

props ryelle, shaunandrews.
fixes #26442.

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git-svn-id: http://core.svn.wordpress.org/trunk@26591 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: Revert [26548], removing _.isEqual() for proper object comparison.

This broke the customizer in IE 11, with possibly other side effects. Revisit in 3.9.

Also reverts [26632].

see #26061 (reopens), fixes #26438.

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git-svn-id: http://core.svn.wordpress.org/trunk@26592 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Widgets: jshint cleanup of widgets.js, see #25821.
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git-svn-id: http://core.svn.wordpress.org/trunk@26593 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix various i18n issues on the dashboard. Limits it to posts and pages only for 3.8.

props SergeyBiryukov, dimadin.
fixes #26066.

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git-svn-id: http://core.svn.wordpress.org/trunk@26594 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: Wait for DOM ready in the customizer, which was breaking IE8.

props ocean90.
fixes #26445.

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git-svn-id: http://core.svn.wordpress.org/trunk@26595 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove redundant closure for such a simple file. see #26445.

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git-svn-id: http://core.svn.wordpress.org/trunk@26596 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Themes: Switch to a text overlay instead of an icon on hover. Numerous reasons outlined in the ticket.

props shaunandrews.
fixes #26440.

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git-svn-id: http://core.svn.wordpress.org/trunk@26597 1a063a9b-81f0-0310-95a4-ce76da25c4cd