* move setLang() to a root layout

* fix: findLang only returns acceptable languages
* fix: fallback to use header x-lang if we haven't setLang yet
* fix: languageSchema, allow uppercase

Approved-by: Linus Flood

app/[lang]/(live)/@footer/page.tsx

@@ -0,0 +1,16 @@
+import { env } from "@/env/server"
+
+import CurrentFooter from "@/components/Current/Footer"
+import Footer, { preload } from "@/components/Footer"
+
+import type { LangParams, PageArgs } from "@/types/params"
+
+export default function FooterSlot({}: PageArgs<LangParams>) {
+  if (env.HIDE_FOR_NEXT_RELEASE) {
+    return <CurrentFooter />
+  }
+
+  preload()
+
+  return <Footer />
+}