Make the DFW paragraph on the About page narrower to mitigate an orphan in Firefox.

See #30435
Props melchoyce

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git-svn-id: http://core.svn.wordpress.org/trunk@30910 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Last about page string. props celloexpressions. fixes #30435.

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Twenty Fifteen: Use dynamic default color value instead of hardcoded color.

props iamtakashi.
see #30733.
Built from https://develop.svn.wordpress.org/trunk@30932


git-svn-id: http://core.svn.wordpress.org/trunk@30921 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Pass locale to wordpress.org theme/plugin API.

In the future this will be used to return localized plugin/theme info.

see #30735.
Built from https://develop.svn.wordpress.org/trunk@30944


git-svn-id: http://core.svn.wordpress.org/trunk@30933 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: hide search input cancel button. See #30728.
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git-svn-id: http://core.svn.wordpress.org/trunk@30934 1a063a9b-81f0-0310-95a4-ce76da25c4cd
About: Fix the WordPress badge.

`css-clean` (minifies our CSS) has an issue when using multiple backgrounds and background position together. Instead of relying on browser support for multiple backgrounds to display the WP logo as SVG, use the `.svg` CSS class.

see #30735.
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git-svn-id: http://core.svn.wordpress.org/trunk@30935 1a063a9b-81f0-0310-95a4-ce76da25c4cd