Trad: Fix missing translation

htdocs/langs/en_US/main.lang

@@ -311,6 +311,7 @@ SubTotal=Subtotal
 TotalHTShort=Total (net)
 TotalTTCShort=Total (inc. tax)
 TotalHT=Total (net of tax)
+TotalHTforthispage=Total (net of tax) for this page
 TotalTTC=Total (inc. tax)
 TotalTTCToYourCredit=Total (inc. tax) to your credit
 TotalVAT=Total tax

htdocs/langs/es_ES/main.lang

@@ -311,6 +311,7 @@ SubTotal=Subtotal
 TotalHTShort=Importe
 TotalTTCShort=Total
 TotalHT=Base imponible
+TotalHTforthispage=Total base imponible para esta página
 TotalTTC=Total
 TotalTTCToYourCredit=Total a crédito
 TotalVAT=Total IVA

htdocs/langs/fr_FR/main.lang

@@ -311,6 +311,7 @@ SubTotal=Sous-total
 TotalHTShort=Total HT
 TotalTTCShort=Total TTC
 TotalHT=Total HT
+TotalHTforthispage=Total HT pour cette page
 TotalTTC=Total TTC
 TotalTTCToYourCredit=Total TTC à votre crédit
 TotalVAT=Total TVA