Post URLs no longer 404 from the admin /en prefix

Clicking on a post from the admin no longer 404s. The admin app was generating outbound URLs with a locale-prefixed path (/en/<project>/<board>/<post>) on the assumption that the feedback portal used a prefix strategy. The portal actually uses no_prefix — the EN routes live without a locale segment in the URL.

The result was every "open post" link from the admin landing on a 404. The fix removes the /en/ prefix when building post URLs from the admin so the link resolves to the canonical portal route. Outbound links are now stable across all four projects.

If you have any bookmark or notification still pointing at an /en/ URL, hit it once after the deploy — the feedback portal does not rewrite those, so the bookmark has to be updated by the consumer.