From my experience, its usually mix of different languages. What ships in the final build might be C/C++ with Lua, custom script + some other custom text format

From my experience, its usually mix of different languages. What ships in the final build might be C/C++ with Lua, custom script + some other custom text formats. Just an example. Then there is Unity, and plethora of frameworks where you write in some language and then it gets translated into another and there are just too many variations. There are still games shipped done in Borland Pascal for that matter :)