Just upload them, we approve any language lobby card and you can see many of them in the site.
Don't need to choose a language, but probably once I make the set I will put it in the title like these, and maybe with some other info like the size:http://www.moviestillsdb.com/movie/0055928/Dr-No.html
If you want to help in that aspect you can put in the comment section something like this:
USA Lobby Card (1979) 14"x11"
Of course, any country, year (in this case I mean the year of the lobby card set more than the movie itself) or other name (some Italian I think are called Photobusta) and size. I use to look here that kind of info:http://movieposters.ha.com/