How to change hardcoded language

So,you bought a key that's been originally bought from Russia and the game is in Russian?

Here's a way how to change it.

Things you will need:
Basic computer knowledge
Hex workshop or any other similiar program

So here's what you do.

Navigate to your OA root folder
Open up hex workshop
Drag'n drop arma2oa.exe to hex workshop
Now,you should see a bunch of values.
Press Crtl+F.Now set type as Text String if it isn't already.In the value box,enter the language your game is in.
In my case it's Russian.
Now,you should see Russian written in bold numbers.Change it to English.
Then locate English and change it to Russian.
Save it and you're done.

I just used Russian as an example.
Hope this helps,have fun.
If you find any mistakes or have issues,please post below.