Added import of force_unicode to utils/text.py

from django.utils.six.moves import html_entities

from io import BytesIO

from django.utils.encoding import force_text

# Import force_unicode even though this module doesn't use it, because some

# people rely on it being here.

from django.utils.encoding import force_text, force_unicode

from django.utils.functional import allow_lazy, SimpleLazyObject

from django.utils import six

from django.utils.translation import ugettext_lazy, ugettext as _, pgettext