Adding a SVG > PNG fallback for IE8 support. See #26348.
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Updating .wp-dialog styling to match the new admin design. Fixes #26328, props SergeyBiryukov, Ocean90.


Built from https://develop.svn.wordpress.org/trunk@26528


git-svn-id: http://core.svn.wordpress.org/trunk@26421 1a063a9b-81f0-0310-95a4-ce76da25c4cd