fixing language issue for original activation email on sites using more than one language

https://openedx.atlassian.net/browse/CRI-217
https://discuss.openedx.org/t/activation-email-in-multiple-languages/2808

openedx/core/djangoapps/user_authn/views/register.py

@@ -214,6 +214,11 @@ def create_account_with_params(request, params):
         django_login(request, new_user)
         request.session.set_expiry(0)
 
+    # Sites using multiple languages need to record the language used during registration.
+    # If not, compose_and_send_activation_email will be sent in site's default language only.
+    create_or_set_user_attribute_created_on_site(user, request.site)
+    preferences_api.set_user_preference(user, LANGUAGE_KEY, get_language())
+
     # Check if system is configured to skip activation email for the current user.
     skip_email = _skip_activation_email(
         user, running_pipeline, third_party_provider,
@@ -224,11 +229,6 @@ def create_account_with_params(request, params):
     else:
         compose_and_send_activation_email(user, profile, registration)
 
-    # Perform operations that are non-critical parts of account creation
-    create_or_set_user_attribute_created_on_site(user, request.site)
-
-    preferences_api.set_user_preference(user, LANGUAGE_KEY, get_language())
-
     if settings.FEATURES.get('ENABLE_DISCUSSION_EMAIL_DIGEST'):
         try:
             enable_notifications(user)