There is excellent news for users of Mac OS X 10.2 using either Gaeilge (Irish Language) or Irish English - 10.2 now has support for Irish Dates, Time, Numbers in both Gaeilge and Irish English and the Standard Irish Keyboard Layout.
However... it seems Apple made a go at translating the Finder into Irish but gave up before they even started. In the process leaving half the menus and icons blank! This is terrible, as even if you're not too bothered about having the Irish finder, it means you cannot change your preference for Irish language webpages in OmniWeb (eg. www.google.ie) or other browsers, without wiping out half your finder menus!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020909055244844