Hello David and thank you for your reply!
Excellent idea, I haven't understood that I can pass the parameter of language in the url. This solution will work for sure!
I haven't enabled auto-detection of the language because I think that users, especially these ones that visit education centers so they don't use their own devices, don't have in mind the language of the browser. I mean that they don't care at all - they just want to visit site (platform) and do what they are asked.
So, steps should be clearly defined without any dependence of the software language. This is currently my thought..
Thank you for your support!