title: How to customize the submit_line.html or any non-editable template in Django
body: <p>"Templates which may be overridden per app or model
  Not every template in contrib/admin/templates/admin may be overridden per app or per model. The following can:</p>
  
  <p>app_index.html</p>
  
  <p>change_form.html</p>
  
  <p>change_list.html</p>
  
  <p>delete_confirmation.html</p>
  
  <p>object_history.html</p>
  
  <p>For those templates that cannot be overridden in this way, you may still override them for your entire project. Just place the new version in your templates/admin directory. This is particularly useful to create custom 404 and 500 pages."</p>
  
  <hr>
  
  <p>Where must I put the submit_line.html file in order to change it? I have got my TEMPLATE DIRS set up for multiple paths. This is what my file structure looks like:</p>
  
  <pre><code>app/
      templates/
          app/
  project_name/
  templates/
      admin/
          project_name/
              app/
  </code></pre>