anchor.diff:          <th width="20%">Student</th>
       <% end %>
       <th>Mission</th>
  -    <th width="20%">Submitted at </th>
  +    <th>Submitted at </th>
   
       <th width="15%">
         <% if can? :manage, SubmissionGrading %>
  
positive.code:               <%= sub.status %>
              </td>
              <td>
                <%= link_to "Review", sub.get_path,
                            class: sub.graded? ? "btn btn-primary" : "btn" %>
              </td>
  
negative.code:         <% end %>
          <td><%= link_to sub.get_asm.get_title, sub.get_asm.get_path %></td>
          <td><%= time_ago_in_words(sub.submit_at || sub.created_at) %> ago</td>
          <!--TODO: refactoring-->
          <% if can? :manage, SubmissionGrading %>
              <td>
                <% sub.submission_gradings.each do |sg| %>
                    <%= link_to sg.get_name, sub.get_path %><br/>
                <% end %>
              </td>
              <td>
                <% grade = sub.submission_gradings.last %>
                <% if grade %>
                    <%= grade.total_grade %> / <%= sub.get_asm.max_grade %>
                <% end %>
              </td>
              <% if sub.submission_gradings.length == 0 %>
  