Salesinvoice Report in two languages

Hello Friends,

I want to create a new salesinvoice report template in two languages (Eng and Serbia).

and i want to create new dialog, on that dialog select language : Eng or Serbia.

When we select Eng then English language salesinvoice is open otherwise Serbia language salesinvoice report is open.

how is it possible. Please help me how to create …

Thanks

Darshana