Finally i think i got it working. As i studied how this works i now have language folder in app/modules path. I removed it from root as i wasn't able to get session no matter what i tried.
I stripped some controller to bare minimum to just display my index file.
Code:
$this->load->view('index');
In my models there are all from another module but it seems not to do anything so i just leave those there for now. Maybe i could remove almost all those as well.
I added this folder to router files so it will add only language code at the end of url
example.com/es
And now i can just make a copy of that folder, rename files and add route for another language. I'm certain there would be much better way.
