If you tick the Set Language checkbox and choose a language from the list, that language will be used for DCP-o-matic. You will need to restart DCP-o-matic to see the new language.

The translations for DCP-o-matic have been contributed by helpful users, and some are incomplete. If your language is not on the last, or there are missing or incorrect translations, visit the DCP-o-matic website to find out how to contribute a translation.