You can use practically any language for games or web servers; they are certainly not constrained to the ones you listed. Game engines are usually written in C++ but the logic usually isn't. Even more importantly, the reason they're written in C++ is because it's usually the best tool for the job, NOT because nothing else is available. Nothing prevents you from writing a game engine in Rust or JavaScript or assembly language or whatever you want. And on servers, anything really does go.