How to get the user's language using api vk?

Question

API

It is necessary to compile language statistics for 81,000 VK users (there is a list of id).
How to find out the languages ​​of each user? (It is desirable not just languages ​​from the "Languages" field, but the interface language)

Answer 1

I could be wrong, but unlike other social. networks - in any way, or getting the locale is not documented.
Alternatively, take the country value and correlate it with the language, although this is a very short way out.