diff --git a/application/language/es/sales_lang.php b/application/language/es/sales_lang.php
index c172efec3..e22b120a7 100644
--- a/application/language/es/sales_lang.php
+++ b/application/language/es/sales_lang.php
@@ -29,7 +29,7 @@ $lang["sales_customer_discount"] = "Descuento";
 $lang["sales_customer_email"] = "Email";
 $lang["sales_customer_location"] = "Ubicacion";
 $lang["sales_customer_mailchimp_status"] = "Estado de Mailchimp";
-$lang["sales_customer_optional"] = "(Requerido para Pagos Adeudados)";
+$lang["sales_customer_optional"] = "(Obligatorio para Pagos Vencidos)";
 $lang["sales_customer_required"] = "(Requerido)";
 $lang["sales_customer_total"] = "Total";
 $lang["sales_date"] = "Fecha";
@@ -64,7 +64,7 @@ $lang["sales_giftcard_balance"] = "Balance de Tarjeta de Regalo";
 $lang["sales_giftcard_number"] = "Número de Tarjeta de Regalo";
 $lang["sales_group_by_category"] = "Grupo por Categoría";
 $lang["sales_group_by_type"] = "Grupo por Tipo";
-$lang["sales_hsn"] = "";
+$lang["sales_hsn"] = "HSN";
 $lang["sales_id"] = "ID de Venta";
 $lang["sales_include_prices"] = "Incluir precios?";
 $lang["sales_invoice"] = "Factura de venta";
@@ -141,7 +141,7 @@ $lang["sales_start_typing_customer_name"] = "Empieza a escribir el cliente...";
 $lang["sales_start_typing_item_name"] = "Empieza a escribir o escanea el código de barras...";
 $lang["sales_stock"] = "Inventario";
 $lang["sales_stock_location"] = "Localizacion";
-$lang["sales_sub_total"] = "Subtotal";
+$lang["sales_sub_total"] = "SubTotal";
 $lang["sales_successfully_deleted"] = "Borrada satisfactoriamente";
 $lang["sales_successfully_restored"] = "Restaurado satisfactoriamente";
 $lang["sales_successfully_suspended_sale"] = "La venta ha sido suspendida.";
@@ -153,8 +153,8 @@ $lang["sales_suspended_sales"] = "Suspendidas";
 $lang["sales_table"] = "Datos";
 $lang["sales_takings"] = "Ventas Diarias";
 $lang["sales_tax"] = "Imp";
-$lang["sales_tax_id"] = "";
-$lang["sales_tax_invoice"] = "";
+$lang["sales_tax_id"] = "Identificador del Impuesto";
+$lang["sales_tax_invoice"] = "Impuesto de la Factura";
 $lang["sales_tax_percent"] = "% de Imp";
 $lang["sales_total"] = "Total";
 $lang["sales_total_tax_exclusive"] = "Sin impuesto";
@@ -167,7 +167,7 @@ $lang["sales_unsuccessfully_updated"] = "Ha fallado la actualización de la vent
 $lang["sales_unsuspend"] = "Retomar";
 $lang["sales_unsuspend_and_delete"] = "Retomar y Borrar";
 $lang["sales_update"] = "Editar";
-$lang["sales_upi"] = "";
+$lang["sales_upi"] = "PIN UPI";
 $lang["sales_work_order"] = "Orden trabajo";
 $lang["sales_work_order_number"] = "Numero Orden Trabajo";
 $lang["sales_work_order_number_duplicate"] = "El numero de orden de trabajo debe ser unico.";