How to correctly set up SEO for a multilingual site with a query parameter?

Question

Search Engine Optimization

Good day!
There is a site in which multilingualism is implemented using the query parameter.

example.com?lang=ru
example.com?lang=en

At the moment, depending on the localization, the client is given the appropriate title, description & keywords.
Is this meta data setting correct? I note that the URL for all languages ​​is the same, the difference is only in the query parameters and that's it.

example.com/contact?lang=ru
example.com/contact?lang=en

Answer 1

correct
, albeit stupid, at least the rewrite URL was replaced