Implement i18n with German and English support (default DE)

middleware.ts

@@ -0,0 +1,30 @@
+import { NextResponse } from "next/server";
+import type { NextRequest } from "next/server";
+
+const locales = ["en", "de"];
+const defaultLocale = "de";
+
+export function middleware(request: NextRequest) {
+    const { pathname } = request.nextUrl;
+
+    // Check if there is any supported locale in the pathname
+    const pathnameHasLocale = locales.some(
+        (locale) => pathname.startsWith(`/${locale}/`) || pathname === `/${locale}`
+    );
+
+    if (pathnameHasLocale) return;
+
+    // Redirect if there is no locale
+    const locale = defaultLocale; // For simplicity, we default to 'de' as requested
+    request.nextUrl.pathname = `/${locale}${pathname}`;
+
+    // Keep searching if the URL changes
+    return NextResponse.redirect(request.nextUrl);
+}
+
+export const config = {
+    matcher: [
+        // Skip all internal paths (_next)
+        "/((?!_next|api|public|manifest|icon|file|globe|next|vercel|window).*)",
+    ],
+};