fix: #4022 Gifting someone a gold account shows "You are now a Builder level account."

app/controllers/user_upgrades_controller.rb

@@ -54,6 +54,6 @@ class UserUpgradesController < ApplicationController
       flash[:error] = e.message
     end
 
-    redirect_to user_upgrade_path
+    redirect_to user_upgrade_path(user_id: params[:user_id])
   end
 end

app/views/user_upgrades/show.html.erb

@@ -3,7 +3,12 @@
     <% if flash[:success] %>
       <h1>Congratulations!</h1>
 
-      <p>You are now a <%= CurrentUser.user.level_string %> level account. Thanks for supporting the site!</p>
+      <% if params[:user_id] %>
+        <p><%= user.name %> is now a <%= user.level_string %> level account. Thanks for supporting the site!</p>
+      <% else %>
+        <p>You are now a <%= user.level_string %> level account. Thanks for supporting the site!</p>
+      <% end %>
+
       <p><%= link_to "Return to posts", posts_path %> </p>
     <% elsif flash[:error] %>
       <h1>An error occurred!</h1>