it is separated, if you could choose your language on setup, theoretically you should find openoffice.org-langpack-[yourlanguage] on your disk.
If you choose to customize the package set during install, you'll see a "Language Support" group towards the bottom. Selecting that allows you to pick exactly which language package sets you want, therefore giving you the right OO languages (among other things). Of course if it doesn't work like that right now, something's wrong. - Chris