* 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-current)/@header/current-content-page/page.tsx

@@ -1,10 +1,7 @@
 import Header from "@/components/Current/Header"
-import { setLang } from "@/i18n/serverContext"
 
 import type { LangParams, PageArgs } from "@/types/params"
 
-export default async function HeaderPage({ params }: PageArgs<LangParams>) {
-  setLang(params.lang)
-
+export default async function HeaderPage({}: PageArgs<LangParams>) {
   return <Header />
 }

app/[lang]/(live-current)/current-content-page/page.tsx

@@ -6,7 +6,6 @@ import { request } from "@/lib/graphql/request"
 
 import ContentPage from "@/components/Current/ContentPage"
 import Tracking from "@/components/Current/Tracking"
-import { setLang } from "@/i18n/serverContext"
 
 import type { LangParams, PageArgs, UriParams } from "@/types/params"
 import type { GetCurrentBlockPageData } from "@/types/requests/currentBlockPage"
@@ -16,8 +15,6 @@ export default async function CurrentContentPage({
   params,
   searchParams,
 }: PageArgs<LangParams, UriParams>) {
-  setLang(params.lang)
-
   try {
     if (!searchParams.uri) {
       throw new Error("Bad URI")

app/[lang]/(live-current)/layout.tsx

@@ -12,7 +12,6 @@ import SkipToMainContent from "@/components/SkipToMainContent"
 import RouterTracking from "@/components/TrackingSDK/RouterTracking"
 import { getIntl } from "@/i18n"
 import ServerIntlProvider from "@/i18n/Provider"
-import { setLang } from "@/i18n/serverContext"
 
 import type { Metadata } from "next"
 
@@ -31,7 +30,6 @@ export default async function RootLayout({
 }: React.PropsWithChildren<
   LayoutArgs<LangParams> & { header: React.ReactNode }
 >) {
-  setLang(params.lang)
   const { defaultLocale, locale, messages } = await getIntl()
 
   return (