anchor.diff:        <% @challenges.each do |challenge| %>
           <tr class="fork">
             <td>
  -            <% if current_user.teacher? %>
  -              <i class="fa <%= challenge.published? ? 'fa-eye' : 'fa-eye-slash' %>"></i>
  -            <% end %>
               <%= link_to challenge.title, peer_review_challenge_path(challenge) %>
             </td>
             <td>
  
positive.code:         <th>Tipo de Revisiones</th>
          <th>Revisiones esperadas</th>
          <th><i class="fa fa-paperclip" title="¿Permite archivos adjuntos?"></i></th>
          <th class="no-sort">&nbsp;</th>
        </tr>
        </thead>
  
negative.code:           <td>
              <%= yes_no challenge.allows_attachment? %>
            </td>
            <% if policy(PeerReview::Challenge).manage? %>
              <td>
                <%= yes_no challenge.published? %>
              </td>
            <% end %>
            <td>
              <div class="btn-group display">
                <% if policy(PeerReview::Challenge).manage? %>
  