Restore multilingual support: / for sr, /en for en with browser detection

src/middleware.ts

@@ -2,12 +2,13 @@ import createMiddleware from "next-intl/middleware";
 import { defineRouting } from 'next-intl/routing';
 
 const routing = defineRouting({
-  locales: ['sr'],
-  defaultLocale: 'sr'
+  locales: ['sr', 'en'],
+  defaultLocale: 'sr',
+  localePrefix: 'as-needed'
 });
 
 export default createMiddleware(routing);
 
 export const config = {
-  matcher: ['/((?!api|_next|_vercel|).*)']
+  matcher: ['/((?!api|_next|_vercel|.*\\..*).*)']
 };