nicer redirect after changing language; rename route

src/game.rs

@@ -52,7 +52,7 @@ async fn retu(
 
         div.mb-sm { (t!("ask_to_change_name", name = client.get_display_name())) }
 
-        form action="/name" method="post" {
+        form action="/game" method="post" {
             fieldset role="group" {
                 input
                     name="name"
@@ -182,6 +182,6 @@ async fn set_name(
 pub(super) fn routes() -> Router<Arc<Backend>> {
     Router::new()
         .route("/game", get(index))
-        .route("/name", post(set_name))
+        .route("/game", post(set_name))
         .route("/{*uuid}", get(game))
 }