Add cancel button to delete modal.

app/templates/main/jobs/job.html.j2

@@ -133,7 +133,8 @@
         All iput and output files will be permanently deleted.</p>
     </div>
     <div class="modal-footer">
-      <a href="{{ url_for('main.delete_job', job_id=job.id) }}" class="modal-close waves-effect waves-green btn red"><i class="material-icons left">delete</i>Delete Job</a></a>
+      <a href="{{ url_for('main.delete_job', job_id=job.id) }}" class="modal-close waves-effect waves-green btn red"><i class="material-icons left">delete</i>Delete Job</a>
+      <a href="#!" class="modal-close waves-effect waves-green btn cancel">Cancel</a>
     </div>
   </div>
 </div>