Fix some bugs in the store on OpenCart

99% working OpenCart store to look at, to fix some bugs in admin interface (if you change the order status it gives an error and you cannot change the status of the order) and when a customer makes an order - the order is, but after you make the order from the client, nothing happens and do not appears that order has been made, change the picture in the menu. Well, there may still some some small bugs fixed.