create users to site with specific language

We’ve created a website that has 8 languages, Russian, Spanish or English to name a few. Each language has its own version of the website.

I’m trying to create users that will be able to only modify the site’s assigned languages.

For example, if I create a user for the Russian version, that person will be only able to modify the Russian version.

The webdesigner who created the website said it cannot be done but I’m still asking, just in case.

For info, I’m using the module polylang

There is actually a plugin that offers this exact functionality: Polylang User Manager:

Polylang User Manager will work with Polylang WordPress multilingual Plugin, it will allow you to restrict access for editors/shop_manager or other user role based on languages they’re not assigned as Translators or editor.