I have just installed and tested DFH and I think its really very, very good script! very useful and well written - congratulations!
I have also tested Polish lang posted here last year. There are some misleading translations, so I corrected them. The most important however, that translaton is encoded in ISO not UTF-8, so there are no Polish diacritics. I have corrected this fault and would like to share my work. I have zip archive containing polish.php file and also necessary to replace: config.php, settings.php and header.php.
Unfortunatelly I cannot find possibility to attach files, so please let me not how to send files.