Django for internationalized sites - are models.User internationalized?

According to documentation (http://docs.djangoproject.com/en/dev/
topics/auth/), models.User contains:

first_name
Optional. 30 characters or fewer.
last_name
Optional. 30 characters or fewer.
email
Optional. E-mail address.

Are "first_name" & "last_name" limited to alphanumeric characters or
can they contain non-English characters like "ü" or non-European
characters like "黒"?

What characters are allowed in the "email" field? Again can it contain
non-English or non-European characters?

Anyone who have built non-English or non-European websites using
Django? What is your experience? Any pitfalls I need to be aware of?

Thanks.

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