hi the openoffice package was split up in 3 packages
one that needs everyone: pacman -S openoffice-base
langpacks (is needed for openoffice-base !!!): pacman -S openoffice-[enteryourlanghere e.g. de for german]
If you want to ship around these problems with language simple use: pacman -S openoffice-[enteryourlanghere e.g. de for german] and openoffice-base is installed with it automatically
optional spellchecking packs (if you need spellcheck): pacman -S openoffice-spell-[enteryourlanghere e.g. de for german]