Multilingual application

Thanks $view_data in MY_controller is a good idea.
But this route $route['^(\w{2})/(.*)$'] = '$2'; wont work if I want to call ie. home/index/7 ??? Am I right?
And what about that slash? Here it is non optional part of that regexp. Is that ok?

I think would be good that you have a default language and if always use it and redirect / (segment(1) empty) to /en (default language)

Greetings.