Help with routes.php, please

[eluser]indapublic[/eluser]
[quote author="Aken" date="1354683036"]Use your .htaccess to redirect URLs that don't have the beginning language segment. That's what I'd do, at least. Maybe someone else can suggest something different.[/quote]
Yep, it is possible. But I want to try use routes for this.

Update: I want to change default language dynamically, .htaccess don't help me with it.