How can I find out what language Pathologic 2 is written in?

Question

Game development

What language is the game written in? What frameworks, libraries were used when writing it? How to see its code?
Where can I find the answers to all these questions?
My English is weak, with programming knowledge superficially. In the Russian-speaking segment, I did not come across answers to these questions. The developers did not respond to questions from the mail.
Topics in which mods for this game would be discussed were also not found. (in Russian).

Answer 1

Look at Wikipedia:

Engine: Unity

So C#