Can't launch the game

[whoarmongar]

To be honest your problem is beyond me, but if I were you I would do this
Remove the russian version, multiple versions cant be good.
Revert your Fr Version (read forum can probably be done through steam)
clean up files and folders
allow steam to autoupdate to latest official patch (no beta)
It should be in. Program Files(x86)/steam/SteamApps/common/il-2 sturmoCoD.

I had the exact same symptoms with a poorly applied patch, yellow cross then nothing, I reinstalled the patch correctly and it worked fine, I thought this was your problem, the extra copy of the game is just a complicating factor that you dont need.

I still think one of these two things are at the root of your problem, I have had problems with this game making very minor changes, for example I changed a button mapping on my joystick and lost all joystick controls. For it to have stopped working something must have changed. If you have auto updates enabled what version is updated for example?