Update/add plugin recommendation strings.

Update [30887], add a translation function to the Vine string.

Merges [30889] to the 4.1 branch.

Fixes #30337.

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Autoprefixer for [30857].

Merges [30884] to the 4.1 branch.

See #30435.

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

Merges [30903] to the 4.1 branch.

Props pavelevap
See #30435

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