fix: add Spanish language support in URL rewrite rules

nginx.conf

@@ -26,7 +26,7 @@ http {
         root /usr/share/nginx/html;
         index index.html;
         
-        rewrite ^/(en|de|zh|vi)/(.*)$ /$2 last;
+        rewrite ^/(en|de|es|zh|vi)/(.*)$ /$2 last;
 
         location ~* \.html$ {
             expires 1h;