anchor.diff:          <div class="col-xs-12">
             <h3>Kategorie</h3>
             <div class="hide_all">
  -            <a href="#" class="compress">ZwiĹ wszystko</a>
  +            <a href="#" class="compress">Zwiń wszystko</a>
             </div>
             <div class="row-separator">
             </div>
  
positive.code:           <h3>Edytuj</h3>
            <%= simple_form_for [@course, @exam] do |f| %>
                <%= f.input :name, label: "Nazwa" %>
                <%= f.input :duration, as: :integer, label: "DĹugoĹÄ w sekundach", input_html: { min: 0 } %>
                <div class="form-group">
                  <label for="minutes_helper">Minuty</label>
                  <input type="number" id="minutes_helper" min="0" name="minutes" value="<%= @exam.duration / 60 %>">
  
negative.code:                 <label for="seconds_helper">Sekundy</label>
                  <input type="number" id="seconds_helper" min="0" max="59" name="seconds" value="<%= @exam.duration % 60 %>">
                </div>
                <%= f.input :published, as: :boolean, label: "Dostępny" %>
                <%= f.button :submit, "Zaaktualizuj" %>
            <% end %>
            <div class="row-separator">
  