anchor.diff:  
   </section>
   
  +<!-- Notifications modal -->
  +<div class="modal fade" id="notifications_modal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  +  <div class="modal-dialog" role="document">
  +    <div class="modal-content">
  +      <div class="modal-header">
  +        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
  +        <h4 class="modal-title">Modal title</h4>
  +      </div>
  +      <div class="modal-body">
  +       <form id="notification-selector" class="hidden" action="/private_student_groups/<%= @privateStudentGroup.id %>/change_teacher_notifications" method="post">
  +            <label>Configurar notificaciones</label>
  +            <p>¿Cuando quiere recibir notificaciones de este grupo?</p>
  +              <select class="form-control">
  +                  <option value="ALL">Cuando suban cualquier recurso</option>
  +                  <option value="PUBLISHING">Solo al públicar excursiones</option>
  +                  <option value="NONE">Nunca</option>
  +              </select> 
  +            </form>
  +      </div>
  +      <div class="modal-footer">
  +        <button type="button" class="btn btn-default" data-dismiss="modal">Cerrar</button>
  +        <button type="button" class="btn btn-primary">Guardar</button>
  +      </div>
  +    </div>
  +  </div>
  +</div>
  +
  +
    <%= content_for :javascript do %>
   
     $("#notification_settings_button").on('click', function(){
  
positive.code:           <!--excursions-->
            <li class="active">
              <a id="pupils_tab" href="#tabPupils" data-toggle="tab">
                <i class="fa fa-book"></i>
                <span class=" hidden-xs"><%=t('private_student.tabs.pupils_tab')%></span>
              </a>
            </li>
  
negative.code: 							<span class="by"><%= t('by') %></span> <%= link_to @privateStudentGroup.private_teacher.name, @privateStudentGroup.private_teacher.subject %>
  							Autor
  						</div>
            </div>
          </header>
          <div class="toolbar-profile">
            <div class="btn-group js_update_profile_info">
              <a id="notification_settings_button" class="btn btn-default btn-for-categorize" data-toggle="modal" data-target="#notifications_modal"><i class='fa fa-bell'></i>Notification Settings</a>
              <!--remove-->
  						<a class="btn btn-default btn-for-categorize" href="<%=credentials_private_student_group_path(@privateStudentGroup)%>"><i class='fa fa-download'></i>Download credentials</a>
            <% if can?(:destroy, @privateStudentGroup) %>
  