anchor.diff:          <td><%= link_to event.teaching_module, event.teaching_module %></td>
           <td><%= event.kind.to_s.upcase %></td>
           <td><%= event.date.strftime "%d/%m/%Y" %></td>
  -        <td><%= event.teacher_hours %></td>
  -        <td><%= event.student_hours %></td>
  +        <td><%= event.duration %></td>
         </tr>
       <% end %>
     </tbody>
  
positive.code:       <th>Module</th>
        <th>Type</th>
        <th>Date</th>
        <th>Heures enseignant</th>
        <th>Heures étudiant</th>
      </tr>
    </thead>
    <tbody>
  
negative.code: <h2>Heures EDT</h2>
  
  <p>
    <%= @user.events.cm.sum :duration %> CM
    / <%= @user.events.td.sum :duration %> TD
    / <%= @user.events.tp.sum :duration %> TP
  </p>
  
  <table class="table">
  