Hi @ndiaga 👋🏼
Thanks for helping !
I did a test and made an order myself from the english version of the front office, with a postal address outside france.
It sent only english emails... so I think there is no missing template strings, I checked all emails and they are ok.
Then I displayed the front office in french, and the language went from "english" to "french" in the back office for the concerned client account.
I sent more emails from the BO but there were still in english...
As far as your know, what is the data on which prestashop decides which email language it sends ?