Using Latin Language for Mac

I figured out how to change the language of my Mac in System Preferences. However, I want to use the default language as Latin, which I can't seem to get to work. I checked it in the "Edit List" popup thing so it appears in the list on the left. I rearrange the list so "Latina" is top, yet even after logging out/back in, it's in English. I tried this with Spanish, just to make sure I wasn't doing something wrong. I ordered "Español" as the top option, and it worked just fine. So, what do I have to do to get Latin to work? Is there a language pack somewhere that I need to install? Or what? Thanks.