7 calls to user_preferred_langcode()

AccountFormController::form in drupal/core/modules/user/lib/Drupal/user/AccountFormController.php
Overrides Drupal\Core\Entity\EntityFormController::form().
action_send_email_action in drupal/core/modules/action/action.module
Sends an e-mail message.
contact_personal_form_submit in drupal/core/modules/contact/contact.pages.inc
Form submission handler for contact_personal_form().
user_cancel_url in drupal/core/modules/user/user.module
Generates a URL to confirm an account cancellation request.
user_pass_reset_url in drupal/core/modules/user/user.module
Generates a unique URL for a user to login and reset their password.
_update_cron_notify in drupal/core/modules/update/update.fetch.inc
Performs any notifications that should be done once cron fetches new data.
_user_mail_notify in drupal/core/modules/user/user.module
Conditionally create and send a notification email when a certain operation happens on the given user account.