app/views/region_validators/_region.html.erb
<li>
<div class='treeitem'>
<%= link_to region.name, :action => 'region', :id => region %>
<em><%= n_('1 validator', '%{num} validators.', region.validators.size) % { :num => region.validators.size } %></em>
<% unless region.children.empty? %>
<ul class='tree'>
<%= render :partial => 'region', :collection => region.children %>
</ul>
<% end %>
</div>
</li>