[itsm] Ticket Detalis (MasterSlave Field)

Hi, When you display the ticket details, some ticket data appear in the right panel. One of the data fields is the TicketMaster field. I need to translate the field label and the content. I tried to translate through the es.pm language file but it has no effect. I tried also modifying the dtl file AgentTicketZoom but it didn't work. ¿Has anyone a suggestion about this? Regards and thanks. Daniel.