It is available in the latest preview release (14986). See de image bellow.
On the left the device portal, on the right a screenshot of the device.
![On the left the device portal, on the right a screenshot of the device](https://i.stack.imgur.com/dOhPW.png)
Edit
About the internationalization, the only thing I've found until now is the keyboard layout option, on the device settings, but it seems to not be working yet, cause I don't see the "?" character that should be present in a pt-br keyboard.
![keyboard layout option](https://i.stack.imgur.com/TUc8J.png)
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