If the browser absolutely 100% of the time knew that difference and showed "Wikipedia FR > Canada", wouldn't it be much simpler for the average user?
The browser could even show specialized UI such as "FR" as a clickable dropdown menu to allow users to switch languages. Chrome already does this for searching a single website through the address bar (type domain.com TAB)
Basically these changes are not thought for you. You are not representative of the average Web user.