* 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

hooks/useLang.ts

@@ -1,12 +1,18 @@
 "use client"
 import { useParams } from "next/navigation"
 
-import { LangParams } from "@/types/params"
+import { Lang } from "@/constants/languages"
+
+import { languageSchema } from "@/utils/languages"
+
+import type { LangParams } from "@/types/params"
 
 /**
  * A hook to get the current lang from the URL
  */
 export default function useLang() {
   const { lang } = useParams<LangParams>()
-  return lang
+
+  const parsedLang = languageSchema.safeParse(lang)
+  return parsedLang.success ? parsedLang.data : Lang.en
 }