[FIX] sale_stock: show complete name of product

In case of changing the quantity on hand of two variants of the same product,
the two message created will have the same name (the name of the
product.template).
Show the name of variant instead.

addons/sale_stock/models/sale_order.py

@@ -346,5 +346,5 @@ class SaleOrderLine(models.Model):
             pickings = line.order_id.picking_ids.filtered(lambda p: p.state not in ('done', 'cancel'))
             for picking in pickings:
                 picking.message_post("The quantity of %s has been updated from %d to %d in %s" %
-                                      (line.product_id.name, line.product_uom_qty, values['product_uom_qty'], line.order_id.name))
+                                      (line.product_id.display_name, line.product_uom_qty, values['product_uom_qty'], line.order_id.name))
         super(SaleOrderLine, self)._update_line_quantity(values)