Issue with .PO/.MO Files

Hello,

Very nice plugin!

We use your plugin in a Multisite environment (main site in EN and subsite in other language) and it works fine in the front-end.

However we have an issue with the language of the emails being sent in the subsite with the different language.
We enabled “Use Plugin .PO/.MO Files” in the Settings, the correct PO and MO files are in the correct place (and include the correct email translations) and the subsite language is in the language we want but emails are still sent in English.

In the frontend the plugin text strings are however translated correctly.

We tried already the “Purge Comment and User Caches” and we have disabled all other caching.

What can still be the cause that emails are not sent in the correct language?

Thank you!