If the product names and descriptions are in another language, the mobile app will pull that text and it will display correctly in the mobile app.
The merchant can also type in other languages in the Design Dashboard so the side Navigation items and other things can also be in another language.
Standard UI Elements such as the Search Bar and Checkout Flow can only be in English.
Your app also supports the same currency as your Shopify store.
We do plan to support multiple languages in the future.