Better translation

htdocs/langs/en_US/stocks.lang

@@ -114,9 +114,9 @@ RecordMovement=Record transfert
 ReceivingForSameOrder=Receipts for this order
 StockMovementRecorded=Stock movements recorded
 RuleForStockAvailability=Rules on stock requirements
-StockMustBeEnoughForInvoice=Stock level must be enough to add product/service to invoice (even if real stock change occurs later on another event)
-StockMustBeEnoughForOrder=Stock level must be enough to add product/service to order (even if stock change occurs later on another event)
-StockMustBeEnoughForShipment= Stock level must be enough to add product/service to shipment (even if stock change occurs later on another event)
+StockMustBeEnoughForInvoice=Stock level must be enough to add product/service to invoice (check is done on current real stock when adding a line into invoice whatever is rule for automatic stock change)
+StockMustBeEnoughForOrder=Stock level must be enough to add product/service to order (check is done on current real stock when adding a line into order whatever is rule for automatic stock change)
+StockMustBeEnoughForShipment= Stock level must be enough to add product/service to shipment (check is done on current real stock when adding a line into shipment whatever is rule for automatic stock change)
 MovementLabel=Label of movement
 InventoryCode=Movement or inventory code
 IsInPackage=Contained into package