add loading text for form submit buttons

app/views/setup/index.html.erb

@@ -32,7 +32,7 @@
       <% end %>
     </div>
     <div class="form-control">
-      <%= f.button button_title, class: 'base-button' %>
+      <%= f.button button_title(title: 'Confirm', disabled_with: 'Processing'), class: 'base-button' %>
     </div>
   <% end %>
 </div>