syncdb untranslated prompts for creating superuser

[Lex Berezhny]

Using latest checkout of django-trunk with Python 2.7:

ubuntu:~/project$ ./manage.py syncdb
Creating tables ...
Creating table django_admin_log
Creating table auth_permission
Creating table auth_group_permissions
Creating table auth_group
Creating table django_content_type
Creating table django_session
Creating table account_user_groups
Creating table account_user_user_permissions
Creating table account_user

You just installed Django's auth system, which means you don't have any superusers defined.
Would you like to create one now? (yes/no): yes
<django.utils.functional.proxy object at 0x9a41dec>:

^{the prompts of username, email, password are displayed as proxy objects instead of translated strings.}

[Lex Berezhny]

Actually, looks like the password is fine, it's just the username and email that are not being translated:

ubuntu:~/project$ ./manage.py syncdb
Creating tables ...
Creating table django_admin_log
Creating table auth_permission
Creating table auth_group_permissions
Creating table auth_group
Creating table django_content_type
Creating table django_session
Creating table account_user_groups
Creating table account_user_user_permissions
Creating table account_user

You just installed Django's auth system, which means you don't have any superusers defined.
Would you like to create one now? (yes/no): yes
<django.utils.functional.proxy object at 0x9a41dec>: lex
<django.utils.functional.proxy object at 0x9ac32ec>: lex@…
Password:
Password (again):
Superuser created successfully.
Installing custom SQL ...
Installing indexes ...
Installed 0 object(s) from 0 fixture(s)

[Preston Holmes]

This should be fixed with ​https://github.com/django/django/commit/2390fe3f4f8f52e24157d79b0c60247207c9716f

if you can reproduce with a checkout later than that version - please do reopen.

[Florian Apolloner <florian@…>]

In 2b916895a1cea39de3280a6910e2886aebfcfc64:

Updated createsuperuser to use unicode_literals. Refs #19757.