diff --git a/htdocs/langs/en_US/bills.lang b/htdocs/langs/en_US/bills.lang
index 03e77ca63bd..e198cce51d8 100644
--- a/htdocs/langs/en_US/bills.lang
+++ b/htdocs/langs/en_US/bills.lang
@@ -16,10 +16,10 @@ InvoiceStandardDesc=This kind of invoice is the common invoice.
 InvoiceDeposit=Deposit invoice
 InvoiceDepositAsk=Deposit invoice
 InvoiceDepositDesc=This kind of invoice is done when a deposit has been received.
-InvoiceProFormat=Proformat invoice
-InvoiceProFormatAsk=Proformat invoice
-InvoiceProFormatDesc=<b>Proformat invoice</b> is an image of a true invoice but has no accountancy value.
-InvoiceReplacement=Replacement invoice. Must replace invoice with reference
+InvoiceProForma=Proforma invoice
+InvoiceProFormaAsk=Proforma invoice
+InvoiceProFormaDesc=<b>Proforma invoice</b> is an image of a true invoice but has no accountancy value.
+InvoiceReplacement=Replacement invoice
 InvoiceReplacementAsk=Replacement invoice for invoice
 InvoiceReplacementDesc=<b>Replacement invoice</b> is used to cancel and replace completely an invoice with no payment already received.<br><br>Note: Only invoice with no payment on it can be replaced. If not closed, it will be automatically closed to 'abandoned'.
 InvoiceAvoir=Credit note
@@ -273,6 +273,8 @@ ConfirmSplitDiscount=Are you sure you want to split this discount of <b>%s</b> %
 TypeAmountOfEachNewDiscount=Input amount for each of two parts :
 TotalOfTwoDiscountMustEqualsOriginal=Total of two new discount must be equal to original discount amount. 
 ConfirmRemoveDiscount=Are you sure you want to remove this discount ?
+RelatedBill=Related invoice
+RelatedBills=Related invoices
 
 # PaymentConditions
 PaymentConditionShortRECEP=Immediate
@@ -324,8 +326,8 @@ FullPhoneNumber=Telephone
 TeleFax=Fax
 PrettyLittleSentence=Accept the amount of payments due by checks issued in my name as a Member of an accounting association approved by the Fiscal Administration.  
 IntracommunityVATNumber=Intracommunity number of VAT
-PaymentByChequeOrderedTo=Check payment are payable to %s send to
-PaymentByChequeOrderedToShort=Check payment are payable to
+PaymentByChequeOrderedTo=Check payment (including tax) are payable to %s send to
+PaymentByChequeOrderedToShort=Check payment (including tax) are payable to
 SendTo=sent to
 PaymentByTransferOnThisBankAccount=Payment by transfer on the following bank account
 VATIsNotUsedForInvoice=* Non applicable VAT art-293B of CGI