<li><%= link_to resource.title, resource_path(resource) %> - <%= link_to resource.language_name, language_path(resource.language) %></li>

<li><%= link_to resource.title, resource_path(resource) %>
  <ul>
    <% resource.languages.each do |language| %>
      <li><%= link_to language.name, language_path(language) %></li>
    <% end %>
  </ul>
</li>

Add languages list to resource display partial.
Add languages list to resource display partial.
