We plan to introduce different languages later this year once we perfect Shedul in English. Meanwhile, there are a few customizations you can make:
Add your whole service menu in your language
Free-type information into the "Service Description"
Free-type your "Cancellation policy" (Setup > Business Settings > Online Booking)
For the website widget, you can customize the button to say anything you like and next to the colour options you can manually name your button (Setup > Online Booking > Booking Button)
Client Notifications can be customised as well where you can type in any message you like in any language! (Setup > Business Settings > Client Notifications)
Also, when using Chrome, you can right click and translate the whole site to your language. It's not a perfect translation but it might help :)