Fix admin permissions bounce, prefixes APIs, and Italian UI leftovers.

Gate permissions on ACL manage + resolve super-admin from live user ranks, restore prefixes API routes, and anglicize hardcoded admin copy with nav i18n.

Co-authored-by: Cursor <[email protected]>

src/app/admin/prefixes/page.tsx

@@ -20,7 +20,7 @@ export default async function PrefixesPage() {
 			<div>
 				<h1 className="text-3xl font-bold tracking-tight">Custom Prefixes</h1>
 				<p className="text-muted-foreground">
-					Gestisci i prefissi degli utenti, la blacklist e le impostazioni
+					Manage user prefixes, blacklist and settings
 				</p>
 			</div>
 			<PrefixesClient canEdit={canEdit} />