REST API support

Hi guys

First I have to say this plugin is excellent.

But in the docs there is written that it supports REST-API.
But when I list the page using this link ?rest_route=/wp/v2/pages/6

I am not getting the other language version, this is the result I get:
http://jsoneditoronline.org/?id=4f35e24d601868831f7ab88fa57be62b

Thanks for any help
Petr