Remove RTL and MP6 references from colors-fresh.css as they're now irrelevant to the file.

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Themes: Restore a label accidentally removed in r26470. Props SergeyBiryukov. See #25948

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Themes: Add missing close tag, see [26462]. see #25959.
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Widgets: highlight all drop zones (open and closed sidebars) on starting to drag a widget to indicate "droppability", fixes #26168.
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Admin CSS: Pinking shears.
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Fix selector for category checklists to apply styles to custom taxonomies too.

props mattheu.
fixes #26324.
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Mobile: Add some bottom spacing to checkboxes on Nav Menu screen.

props mattheu.
fixes #26325.
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Network Admin: Remove a superfluous description field and merge two similar strings.

props Hanni, SergeyBiryukov.
fixes #26260.
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Themes: Search the description too.

props dd32.
fixes #26309.
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Themes: Add type="search" to search. fixes #26331.
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