interface language in Windows

hi,
My friend and I are trying to translate the GoldenDict software to our language( Farsi ) for Windows users .but unfortunatly we could't because when we want to run it(GoldenDict) on Qt we face a problem.That 's there is'nt other languages (except English) in the combobox of interface language in edit/preferences/interface.we check the source code but we could't find the solution .It's interesting that we haven't such the problem in linux and GoldenDict runs without any problem.
could you help me in this case?
My friend and I are trying to translate the GoldenDict software to our language( Farsi ) for Windows users .but unfortunatly we could't because when we want to run it(GoldenDict) on Qt we face a problem.That 's there is'nt other languages (except English) in the combobox of interface language in edit/preferences/interface.we check the source code but we could't find the solution .It's interesting that we haven't such the problem in linux and GoldenDict runs without any problem.
could you help me in this case?