убрал лишние импорты

django_messages/fields.py

@@ -3,9 +3,7 @@ Based on http://www.djangosnippets.org/snippets/595/
 by sopelkin
 """
 
-from django import forms
 from django.forms import widgets
-from django.utils.translation import ugettext_lazy as _
 
 from django_messages.utils import get_user_model, get_username_field