First it looks like the issue was solved.
Unfortunately now all the other languages goes wrong. The body text of the email for all the other languages (NL, AT, DK, Fi, FR, NO, DE, PL, SE) is now in English instead of the translated version.
This is the situation for the 'review reminder' email.
For the 'Review for discount' email the situation has not changed. So the body text of the CH and BE email are both in English.
but the thing is the author is adding WPML compatibility code from their side and is not part of our compatibility program, so the next steps and the best would be here to contact the plugin author, report this issue, and invite them to our GoGlobal program to work with our devs, will be glad to help. This needs further compatibility implementation and changes.