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If Dutch is a language directory available in the module distribution:
One simple method is to rename the Dutch language directory to the language of your default installation. So if you have an English default language in the XOOPS installation, rename the Dutch language directory in friendfinder to "english" and update the module. This will now display the module in Dutch. Easy...
If you do not have Dutch in the language files:
Then, you either have to find someone to translate it for you of make files yourself. Make copies of all your language files and edit all language equivelants. Place them in a language directory and name it after your default language like above.
Richard