I'm using the custom certificate module in Moodle 3.8.2.
Our site has spanish as default language but the certificates we generate must be in english independently of the user preferred language or the actual displaying language the user has selected. This problem affects only to the dates in the certificate (issue date and birthdate, this last was defined by us as a custom user field).
We came to the partial solution of forcing the course languange to english and this will generate the certificates with the dates in english. The problem is that the certificates sent to the user and the administrator by mail have the dates in spanish.
Is there any way in which we can force the certificate language (specially the mailing ones)?