Hi, i've completed the french translation file which i share by attaching it to this post.
Note that in this file, some labels are customized for our business (ITEM -> Article; SKU -> Réf; ...) These custom labels should be modified to reflect a more generic translation purpose. As much as I could see in the Invoice-Manager extension, it seams that there is no possibility to overwrite the labels which would originate from a generic translation file, like others Joomla extensions do. It would be nice if it were possible to do that.
Thanks