custom submit button

app/views/submissions/_email_form.html.erb

@@ -48,6 +48,8 @@
     <%= render('submitters_order', f:, template:) if Accounts.can_send_emails?(current_account) %>
   </div>
   <div class="form-control">
-    <%= f.button button_title(title: 'Add Recipients'), class: 'base-button' %>
+    <%= content_for(:submit_button) || capture do %>
+      <%= f.button button_title(title: 'Add Recipients'), class: 'base-button' %>
+    <% end %>
   </div>
 <% end %>