tags: image and css - show ID in assets/index

app/views/admin/assets/index.html.erb

@@ -8,6 +8,7 @@
 
 <table>
   <tr>
+      <th><%= t('admin.id') %></th>
       <th><%= t('admin.file_name') %></th>
       <th><%= t('admin.description') %></th>
       <th><%= t('admin.format') %></th>
@@ -18,6 +19,7 @@
 
 <% @assets.each do |asset| %>
   <tr>
+    <td><%= asset.id %></td>
     <td><%= link_to asset.filename, asset.data.url, :target => '_blank' %></td>
     <td><%= asset.description %></td>
     <td><%= asset.data.file.content_type %></td>