* 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)/(protected)/my-pages/profile/@membershipCards/page.tsx

@@ -5,16 +5,12 @@ import Link from "@/components/TempDesignSystem/Link"
 import Body from "@/components/TempDesignSystem/Text/Body"
 import Subtitle from "@/components/TempDesignSystem/Text/Subtitle"
 import { getIntl } from "@/i18n"
-import { setLang } from "@/i18n/serverContext"
 
 import styles from "./page.module.css"
 
 import type { LangParams, PageArgs } from "@/types/params"
 
-export default async function MembershipCardSlot({
-  params,
-}: PageArgs<LangParams>) {
-  setLang(params.lang)
+export default async function MembershipCardSlot({}: PageArgs<LangParams>) {
   const intl = await getIntl()
   const membershipCards = await getMembershipCards()