Due dates and number of submissions work

problem.html

@@ -1,7 +1,11 @@
 <h2> ${ problem['name'] } </h2>
   ${ problem['html'] }
   <br>
+
   <input type="hidden" name="problem_id" value="${ problem['name'] }"> 
 % if check_button:
   <input id="check_${ id }" type="button" value="${ check_button }" >   
 % endif
+% if save_button:
+  <input id="save_${ id }" type="button" value="Save" >   
+% endif