Themes: Remove some unused invalid CSS. See #25948

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Increase the click target to 100% of the add-new-theme element. Props scottbasgaard. Fixes #25960

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Remove gradient for invalid menu items. props melchoyce. fixes #26144.
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Fix thickbox positioning on Manage Themes screen. Adjust thickbox resizing code on various screens for new toolbar height.

see #26078. fixes #26140.
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Fix keyboard accessibility for row actions in list tables. Restore the CSS part of [25592], accidentally reverted in [26072].

fixes #26145.
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Twenty Fourteen: fix typos and a correct `@return` value, props morganestes. See #25946.
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Twenty Fourteen: style `cite` element correctly when not in a blockquote. See #25946.
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