anchor.diff:  <div class="columns">
     <div class="column col-5">
       <label class="info-label"><%= Order.human_attribute_name 'firm_id' %></label>
  -    <div class="info-content"><%= @order.firm.name %></div>
  +    <div class="info-content"><%= link_to @order.firm.name, @order.firm %></div>
     </div>
   
     <div class="column col-2">
  
positive.code:         <th><%= OrderLine.human_attribute_name 'product_id' %></th>
          <th><%= OrderLine.human_attribute_name 'detail' %></th>
          <th><%= OrderLine.human_attribute_name 'unit_price' %></th>
          <th><%= OrderLine.human_attribute_name 'tax_rate' %></th>
          <th><%= OrderLine.human_attribute_name 'tax' %></th>
          <th><%= OrderLine.human_attribute_name 'subtotal' %></th>
          <th><%= OrderLine.human_attribute_name 'remaining_amount' %></th>
        </tr>
        </thead>
  
negative.code:       <% @order.lines.each do |line| %>
          <tr>
            <td><%= line.amount %> <%= line.unit %></td>
            <td><%= link_to line.product.name, product_path(line.product) %></td>
            <td><%= line.detail %></td>
            <td><%= line.unit_price %></td>
            <td><%= line.subtotal %></td>
            <td><%= line.tax_rate %></td>
            <td><%= line.tax %></td>
            <td><%= line.remaining_amount %> <%= line.unit %></td>
          </tr>
        <% end %>
  