I have noticed that the received woocomerce e-mail are always sent in english however the website language is in French. I have checked the transmation with loco translate and everything seems to be OK. Moreover all users has the french language set.
I do know if your theme overide sommeting in woocomerce and it is not update. The problem did not exist before.
The french is already set up as main language for the website.
I figured out the problem, I went to Loco Translate and I have sychronized with the source and noticed that some strings were obsolete and the new ones are not translated. It seems that in the last updates, woocommerce has changed something and the translation is no longer 100% so I am trying to translate as much as I can and sychronise it with the source