Add missing translations

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

@@ -9,7 +9,7 @@
 	<table>
 		<thead>
 		<tr>
-			<td class="<%= @attribute_type %>s"><%= t("admin.#{@attribute_type}") %></td>
+			<td class="<%= @attribute_type %>s"><%= t("#{@attribute_type}") %></td>
 			<td class="action"><%= t(:action) %></td>
 		</tr>
 		</thead>