<h4><%= t(:add_option_types) %></h4>
<table class="index">
  <tr data-hook="option_type_header">
    <th><%= t(:name) %></th>
    <th><%= t(:presentation) %></th>
    <th></th>
  </tr>
  <% @available_option_types.each do |ot| %>
  <tr data-hook="option_type_row">
    <td><%= ot.name %></td>
    <td><%= ot.presentation %></td>
    <td class="actions"><%= link_to icon('add') + ' ' + t(:select),
                            url_for(:controller => 'admin/option_types',
                                    :id => ot,
                                    :product_id => @product.permalink,
                                    :action => 'select',
                                    :option_type_id =>  ot),
                                    :remote => true,
                                    :class => 'iconlink' %>
    </td>
  </tr>
  <% end %>
  <% if @available_option_types.empty? %>
  <tr data-hook="option_type_empty">
    <td colspan="3"><%= t(:none_available) %></td>
  </tr>
  <% end %>
</table>

<h4><%= t(:add_option_types) %></h4>
<table class="index">
  <thead>
    <tr data-hook="option_type_header">
      <th><%= t(:name) %></th>
      <th><%= t(:presentation) %></th>
      <th></th>
    </tr>
  </thead>
  <tbody>
    <% @available_option_types.each do |ot| %>
      <tr data-hook="option_type_row">
        <td><%= ot.name %></td>
        <td><%= ot.presentation %></td>
        <td class="actions"><%= link_to icon('add') + ' ' + t(:select),
                                url_for(:controller => 'admin/option_types',
                                        :id => ot,
                                        :product_id => @product.permalink,
                                        :action => 'select',
                                        :option_type_id =>  ot),
                                        :remote => true,
                                        :class => 'iconlink' %>
        </td>
      </tr>
    <% end %>
    <% if @available_option_types.empty? %>
      <tr data-hook="option_type_empty">
        <td colspan="3"><%= t(:none_available) %></td>
      </tr>
    <% end %>
  </tbody>
</table>

Add <thead> and <tbody> tag for <table>
Add <thead> and <tbody> tag for <table>
