Hi,
It depends how you use Falang.
The language is stored in the session so you can have the same url but with a different language in the session.
You can also have Falang with the "folder" organization, where the language will always be in the url.
The best is to contact the Falang support team for more precision.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.