In the product page, I cannot translate the terms related to the wish list :
Add To Wishlist / The product is already in the wishlist! / Browse Wishlist
As they are considered being in my default language (french) so I cannot change them. The only thing I can do is to translate them in English that is useless.
From what I've seen all the rest is fine in terms of translation and I've the feeling that those ones are hard coded.
Fyi, I'm using translatepress.
No need to answer I have found the solution. It was in the plugin.