Move plugin details link into the description area.

fixes #17902.

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Language chooser imporvements.
 * Use a translated 'Continue' string.
 * Go back to using a select element.
 * Only show a spinner when we're installing a language. 

see #28577.

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Media modal: use the same classes to hide the "or" that is above the "Select files" button when no drag-drop support. See #28851.
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git-svn-id: http://core.svn.wordpress.org/trunk@29151 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Language chooser: Adjust continue button alignment.

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Use wp_normalize_path() in plugins_url().

props paulschreiber.
fixes #29058.
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git-svn-id: http://core.svn.wordpress.org/trunk@29153 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media modal/grid: remove thumbnail resizing from JS, only keep setting number of columns. Props avryl, see #27423.
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Verify the MAC earlier in WP_Customize_Widgets. props duck_.

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