Ensuring opt-out message is in correct language?

[vavroom]

I run a CiviCRM install on WordPress, in both FR (default) and EN.

When sending mail with CiviMail, the opt out link systematically sends the users that click on it to the EN version of that message. I can't seem to find where to create/edit this so a FR message is included on the FR mailings, and EN for the EN mailings.

Any pointers would be greatly appreciated.

Nic

P.S. this might be why people tell me "the opt out link isn't working" - not reading EN, hence not clicking on the confirmation button. Because the link works for me on tests otherwise