Fix (un)enrollment email default language

Description

When one or many users are sent an enrollment or unenrollment email via
the teacher subscription form, the emails are written in the user
language. If the user has no preferred language, e.g: when the user does
not exist, the platform language is supposed to be selected. In
practice, the emails were not being translated at all.

Assignee

Ned Batchelder

Reporter

Edx Admin [Administrator]

Labels

None

Contributor Name

Régis Behmo

Repo

edx/edx-platform

Customer

Epic Link

None

OSCM Assignee

None

Platform Map Area (Levels 1 & 2)

None

Platform Map Area (Levels 3 & 4)

None

Blended Hour Utilization Percentage

None

Priority

Unset
Configure