How can I add a language tag to my multilingual site?

Site URL: http://www.lerligisa.com

Hi, 

I created a multilingual website (French, English), and I would like the notification to clients email to appear in the language of the website they are navigating on, and making their order from. For example, if a French user is ordering on the French version of the website, I would like his confirmation email order to be in French, and not in English. Same thing for the confirmation shipping order email, the payment declined email, and the confirmation of subscription to the newsletter etc... Squarespace only allows me to use one language at a time for now. So all my notification to clients are in English. How can I add a language tag on my website? 

Thanks in advance! 

Eva

Hello,

have you found the solution? I have the same problem.

Thank you,

Urša