fix(i18n): load messages by route locale

Import locale JSON messages directly in the [locale] layout to ensure DE pages render DE strings instead of falling back to EN.

Co-authored-by: dennis <dennis@konkol.net>

app/[locale]/layout.tsx

@@ -1,5 +1,5 @@
 import { NextIntlClientProvider } from "next-intl";
-import { getMessages, setRequestLocale } from "next-intl/server";
+import { setRequestLocale } from "next-intl/server";
 import React from "react";
 import ConsentBanner from "../components/ConsentBanner";
 
@@ -13,7 +13,9 @@ export default async function LocaleLayout({
   const { locale } = await params;
   // Ensure next-intl actually uses the route segment locale for this request.
   setRequestLocale(locale);
-  const messages = await getMessages();
+  // Load messages explicitly by route locale to avoid falling back to the wrong
+  // language when request-level locale detection is unavailable/misconfigured.
+  const messages = (await import(`../../messages/${locale}.json`)).default;
 
   return (
     <NextIntlClientProvider locale={locale} messages={messages}>