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