Need help with language helper

You don't have too, but in case you need us to help you debug your system you need to supply a lot of more code. The best option is to make a small demo with just your language code and upload it somewhere.

E.g.
What's in your language helper?
You controller specifies french and not fr, so will /english work? (In case your route are broken)
What does it do with $langauge after you have supplied it?
Do you have multiple controllers or just one?
etc