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.
The Osmo apps are 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, and the Adventure Mode of the Words game is not localized.
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.