Osmo is currently available in the following languages:
English, Chinese (Traditional and Simplified), Danish, Dutch, French, German, Italian, Japanese, Norwegian, Spanish and Swedish. Note that the tiles for the Words game currently only include English alphabet letters.
To switch Osmo interface messages to a language other than English, you need to change the language setting on your iPad. Here are the instructions from the Apple website. After you do that, open any Osmo app, and you will be prompted to select between English and your other language as the preferred language for that Osmo app.
There are many albums in languages other than English that come with the Words app right now. You don't need to switch your interface messages from English to another language in order to use them. You can make more albums by clicking here.
Pizza Co. has written words that appear on the screen, and those will be in the language of your iPad or the language you select. The spoken language of the characters is not a real language, it's make-believe. We plan to reveal more about this make-believe language in the near future.
If you find the 'Osmolian' language distracting, please feel free to lower the iPad volume accordingly.
Mo, in Osmo Monster, only speaks English at this time. Please stay tuned as we localize this game in 2017 and beyond.