Move a `<code>` tag out of a localised string on the About page.

Props pavelevap
See #30435

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Twenty Fifteen: Remove unnecessary `esc_html()` from `get_the_date()` and `get_the_modified_date()`.

see #30724.
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git-svn-id: http://core.svn.wordpress.org/trunk@30895 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In response to regressions on .com, fix MEjs styles for screen reader text and overflow on the volume slider.

Props obenland.
See #30281.

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git-svn-id: http://core.svn.wordpress.org/trunk@30897 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: fallback hex color for no-comments text should come first.

Props iamtakashi, fixes #30730.
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Revert [30036].

see #18035
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