anchor.diff:        <ul class="nav multiple-select">
           <% categories.each do |category| %>
             <% category.children.each do |subcategory| %>
  -            <li><%= link_to subcategory.human_name, promises_path(category_id: category.id, subcategory_id: subcategory.id) %></li>
  +            <li><%= link_to subcategory.human_name, promises_path(category_id: category.id, subcategory_id: subcategory.id, party_slug: @party_slug %></li>
             <% end %>
           <% end %>
         </ul>
  
positive.code:       <h6>Partier</h6>
        <ul class="nav multiple-select">
          <% parties.each do |party| %>
            <li><%= link_to party.name, promises_path %></li>
          <% end %>
        </ul>
      </div>
  
negative.code:       <h6>Hovedkategorier</h6>
        <ul class="nav multiple-select">
        <% categories.each do |category| %>
          <li><%= link_to category.human_name, promises_path(category_id: category.id, party_slug: @party_slug) %></li>
        <% end %>
        </ul>
      </div>
  