'Preferred language' for notifications is currently not present on the self-registration form. It could be be great if we could add it to let borrowers choose their language upon registration.
Since lang is just a field in the borrowers table, I'm kind of surprised this is missing. It is also missing from the list of fields that can be selected/deselected for PatronSelfRegistrationBorrowerUnwantedField.
*** Bug 30833 has been marked as a duplicate of this bug. ***
Older bug, but the other has a patch :) *** This bug has been marked as a duplicate of bug 34438 ***