finish group_orders i18n + controller

app/views/group_orders/_orders.html.haml

@@ -1,9 +1,9 @@
 %table.table.table-striped
   %thead
     %tr
-      %th Lieferantin
-      %th Ende
-      %th Summe
+      %th= t '.supplier'
+      %th= t '.ending'
+      %th= t '.sum'
   %tbody
     - for order in orders
       - group_order = order.group_order(@ordergroup) # Get GroupOrder if possible
@@ -13,4 +13,4 @@
         %td= format_time(order.ends)
         %td.numeric= group_order ? number_to_currency(group_order.price) : "--"
 - if pagination
-  = pagination_links_remote @closed_orders
+  = pagination_links_remote @closed_orders