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A list, maybe somewhere on the internet but if you look in the config folder you can see the supported laungage in the text files, just remember you arnt going to get crylic or any pictograph type writing so some eastern euopean arab middle eastern and chinese alphebets will probably not be supported

I don't know why they don't have a search function, I think its because they don't want you to hijack another persons thread or something, which is stupid, its like when you double post because you made a mistake on the first post and there is no edit button, and the mods get mad at YOU.
 
main game folder, settings.cfg.file, first line should be
0 #LANGUAGE

If you want a different language then change 0 into a different number:
0=english, 1=french 2=italian, 3=spanish, 4=german 5=polish (and I assume 6 = portugese, 7 = russian). Not all text may have been translated and text will either shown as english or no text at all. My Armageddon did show no text in game menus if set to 6 or higher.