Themes page: Don't display the Author as a link if the Author has no AuthorURI set. Props morganestes. Fixes #26098

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Fix the editor switching tabs position on small screens, props ryelle, fixes #26151.
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Themes: Move the escaping of content from JS back to PHP. This allows us to take advantage of the display() WP_Theme method to translate the text properly, and to strip out any HTML tags we don't wish to display. Fixes #26100. See #25948

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