anchor.diff:                class: 'btn btn-danger' do %>
                   <i class="icon-trash"></i>
               <% end %>
  -          <% else %>
  -            &nbsp;
  -          <% end %>
           </td>
  +        <% end %>
   
         </tr>
       <% end %>
  
positive.code:           <%= datetime_format(material.updated_at) %>
          </td>
  
          <td>
            <% if (can? :manage, Material) && not(material.is_virtual) %>
              <%= link_to edit_course_material_path(@course, material), class: 'btn' do %>
                <i class="icon-edit"></i>
              <% end %>
  
negative.code:           <%= datetime_format(subfolder.updated_at) %>
          </td>
  
          <% if (can? :manage, Material) && not(subfolder.is_virtual) %>
          <td>
              <%= link_to course_edit_material_folder_path(@course, subfolder), class: 'btn' do %>
                <i class="icon-edit"></i>
              <% end %>
  