Problems with the user's logon language

HI expert:

I am developing one application that retrieves data from SAP via RFC´s.

I created the objects MBO´s which are created with the user and password to login to the application.(Runtime Data Source and Connections Property)

My problems is I need login to the 'Sap System' with user´s language also.

I have two users, one in Spanish and the other one in English.

what can I do?

Best regards.

Maria Elena