Scanning the forum for info on how to make my own locale - found no step-by-step guide so posting this
- Make copy of english language file to a new locale language file
e.g Copy en-GB.com_jfbconnect.ini to a new file matching your locale, in my case da-DK.com_jfbconnect.ini
See www.facebook.com/translations/FacebookLocales.xml for supported locales.
- Translate strings in your new language file
- Upload file to /yoursite.com/language/xx-YY
e.g in my case with a Danish locale I uploaded da-DK.com_jfbconnect.ini to /mysite.com/language/da-DK
Note: My translation is site specific and slightly more userfriendly worded (IMO) so not submitting it for general use