anchor.diff:    <%= link_to t('new_exercise'), new_exercise_path, class: 'btn btn-primary' %>
     <%= link_to t('new_guide'), new_guide_path, class: 'btn btn-primary' %>
   
  -</div>+</div>
  
positive.code:           <td><%= language_image_tag exercise.language %> <%= exercise.language %> </td>
            <td>
              <%= glyphicon_for_exercise(exercise) %>
              <%= exercise.title %>
            </td>
            <td><%= exercise.tag_list %></td>
            <td><%= link_to t('show'), exercise %></td>
            <td><%= link_to t('my_submissions'), exercise_submissions_path(exercise) %></td>
            <td><%= link_to t('new_submission'), new_exercise_submission_path(exercise) %></td>
            <% restricted_to_author exercise do %>
  
negative.code:       <th><%=t('language')%></th>
        <th><%=t('title')%></th>
        <th>Tags</th>
        <th colspan="4"><%=t('actions')%></th>
      </tr>
      </thead>
  
  