Hi,
There is no translation for that in HikaShop because it's the name of the custom field.
But you can create a translation for " COMPLEMENT " in your language override to override it.
You can also rename the label of the custom field if you want to just rename it and not translate it in several languages.
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.