In a recent post Thomas mentions that there he doesn't want to split up the translations into more files because it makes it harder for translators.
If you really want to make it easy to translate, I suggest you manage translation on a dedicated platform. Transifex <http://transifex.net> is easy to set up and pretty powerful, Translatewiki is in some ways better and there you could possibly use labels from the OpenStreetMap website translations. It takes much more time and effort to set up on Translatewiki <http://translatewiki.net> though since you cannot do it yourself. -- Guttorm
