Fix ie could not submit resources.

Author: BennyZhang-Canviz

schools/templates/schools/classdetails.html

@@ -271,7 +271,7 @@ <h5 class="resources-title col-md-8"></h5>
 										<button type="button" class="btn btn-secondary btn-cancel" data-dismiss="modal">Cancel</button>
 										<button type="button" class="btn btn-primary btn-save">Save</button>
 										<button type="button" class="btn btn-primary btn-publish">Assign</button>
-										<button type="submit" class="btn btn-primary btn-update">Update</button>
+										<button type="button" class="btn btn-primary btn-update">Update</button>
 									</div>
 									</form>
 								  {%else%}
@@ -305,7 +305,7 @@ <h5 class="handin-title col-md-8"></h5>
 
 									<div class="modal-footer">
 										<button type="button" class="btn btn-secondary btn-cancel" data-dismiss="modal">Cancel</button>
-										<button type="submit" class="btn btn-primary btn-submit">Submit</button>
+										<button type="button" class="btn btn-primary btn-submit">Submit</button>
 									</div>
 									</form>
 									{% endif %}