If someone happens to care:
Just noticed where this command is used. It's used in the startup.sqs to show different loading screens depending on the distribution region.
So if the game is US version it gets the "Armed Assault: Combat Operations" screens while other regions get the regular ArmA stuff..
And btw,
if a Polish player was detected,U could present him a Polish Briefing
Like Wolfrug said ArmA does this automatically already, all language localisations have their own briefings..
briefing.Polish.html for example.