Hi,
Can I/how can I use different languages in the Cart add on?
Regards
Kristoffer
Have you already added the language you need in Backlight. > Admin > Settings > Languages and made it the Default language?
After that’s been created, in Backlight go to Cart > Settings > Languages, click on Manage language for your language and fill out the entries.
In your page template, under Top Pallet, make sure that Language Selector is enabled.
more details here