Greek Online Shop (OSCommerce) Totals Calculation but first have to Translate it

Greek Online Shop (OSCommerce) Need to change the way that the points redemption is calculated on Frontend and Backend and writed on "orders_total" Table on field "ot_subtotal_ex". Now the calculation of "ot_subtotal_ex" field is as bellow ot_subtotal_ex = Net product prices net I want the "ot_subtotal_ex" to be calculated as follow if a points redemption is present "ot_subtotal_ex" = Net product prices -(minus) ot_redemptions files that are used as I know (attached) admin/[login to view URL] ->lines 1858-1891 [login to view URL] ->find [login to view URL] admin/includes/functions/[login to view URL] ->lines 2211 because it's a module maybe this to includes/modules/order_total/[login to view URL] or [login to view URL] see attached pictures after changes it must look like the pictures nr-2 ----- So in order to start Forgot all the above and Start to make the Translation of the Totals Section of admin/[login to view URL] (see [login to view URL]) and the Translation of admin/[login to view URL] (see [login to view URL]) so you can understand what every field means in English and we can discus the above job. This job is only the Translation (converting inline to work with the language files) of the Totals Section of admin/[login to view URL] (see [login to view URL]) and the Translation of admin/[login to view URL] (see [login to view URL]) files of the Totals Section of admin/[login to view URL] (see [login to view URL]) and the Translation of /admin_sifis/includes/languages/english/[login to view URL] (see [login to view URL]) and I don't know where the file is used for the Totals in /admin/[login to view URL] maybe it should be in /admin_sifis/includes/languages/english/modules/order_total/[login to view URL]