At the moment Timely is only offered in English. This is because we currently don't have the technical infrastructure or support resources to offer it in another language.
We don't currently have a timeframe for adding this capability but it's unlikely that we'll be adding language support within the next couple of years.
We are certainly aware that our customers want many other languages and once this is possible we will let everyone know!
If you are wanting to add instructions in another language to the different steps of the online booking process, you can do so in Setup > Online bookings > Add your own text.