feat: Add language switcher component to footer

src/app/not-found.tsx

@@ -0,0 +1,8 @@
+
+export default function NotFoundPage() {
+  return (
+    <main className="flex min-h-screen flex-col items-center justify-start">
+      <h1>404</h1>
+    </main>
+  );
+}