add carton editor to update

lib/pages/carton/mix_carton/mix_carton_submit.dart

@@ -18,6 +18,7 @@ typedef OnCreateMixCarton = Function();
 typedef OnPrevious = Function();
 
 class MixCartonSubmit extends StatefulWidget {
+  final bool isNew;
   final FcsShipment shipment;
   final List<Carton> cartons;
   final String cartonSizeType;
@@ -37,7 +38,8 @@ class MixCartonSubmit extends StatefulWidget {
       required this.cartonSizeType,
       this.length = 0,
       this.width = 0,
-      this.height = 0})
+      this.height = 0,
+      this.isNew = true})
       : super(key: key);
 
   @override
@@ -253,7 +255,8 @@ class _MixCartonSubmitState extends State<MixCartonSubmit> {
               mainAxisAlignment: MainAxisAlignment.center,
               children: <Widget>[
                 Flexible(
-                  child: LocalText(context, 'box.crete.carton',
+                  child: LocalText(context,
+                      widget.isNew ? 'box.crete.carton' : 'box.update.btn',
                       color: Colors.white, fontSize: 15),
                 ),
                 const SizedBox(width: 5),