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.
Built from https://develop.svn.wordpress.org/trunk@30905


git-svn-id: http://core.svn.wordpress.org/trunk@30895 1a063a9b-81f0-0310-95a4-ce76da25c4cd