Trans: text more clear

htdocs/langs/en_US/products.lang

@@ -109,7 +109,7 @@ BarcodeValue=Barcode value
 NoteNotVisibleOnBill=Note (not visible on invoices, proposals...)
 CreateCopy=Create copy
 ServiceLimitedDuration=If product is a service with limited duration:
-MultiPricesAbility=Activate the multi-prices
+MultiPricesAbility=Several level of prices per product/service
 MultiPricesNumPrices=Number of prices
 MultiPriceLevelsName=Price categories
 AssociatedProductsAbility=Activate the virtual products feature
@@ -222,7 +222,7 @@ BarCodeDataForProduct=Barcode information of product %s :
 BarCodeDataForThirdparty=Barcode information of thirdparty %s :
 ResetBarcodeForAllRecords=Define barcode value for all records (this will also reset barcode value already defined with new values)
 PriceByCustomer=Price by customer
-PriceCatalogue=Catalogue Price
+PriceCatalogue=Unique price per product/service
 PricingRule=Pricing Rules
 AddCustomerPrice=Add price by customers
 ForceUpdateChildPriceSoc=Set same price on customer subsidiaries