* 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)/(public)/hotelreservation/my-stay/[refId]/page.tsx

@@ -2,15 +2,12 @@ import { Suspense } from "react"
 
 import { MyStay } from "@/components/HotelReservation/MyStay"
 import { MyStaySkeleton } from "@/components/HotelReservation/MyStay/myStaySkeleton"
-import { setLang } from "@/i18n/serverContext"
 
 import type { LangParams, PageArgs } from "@/types/params"
 
 export default async function MyStayPage({
   params,
 }: PageArgs<LangParams & { refId: string }>) {
-  setLang(params.lang)
-
   return (
     <Suspense fallback={<MyStaySkeleton />}>
       <MyStay reservationId={params.refId} />