I run a multilingual (de/fr) moodle installation (3.3.1) and everything works as expected with the notable exception of two emails. Both are sent from within modules; "Custom Certificates" and "Email-based self-registration with admin confirmation". The issue with those is that no matter what, the mail is sent out in german instead of french.
I made sure that the text is translated and those translations saved (through Admin menu), made sure all caches have been purged, set the users preferred profile language to french, browse the site in french – and still I get the mail in german.
Has anyone ever stumbled upon a similar problem? I'd be extremely grateful for any hints as to what could be causing this issue and how to go about resolving it.
Thanks in advance!