Replace ugettext_lazy() with gettext_lazy() for Django 3.0
Replace ugettext_lazy() with gettext_lazy() for Django 3.0

otherwise we get:

RemovedInDjango40Warning: django.utils.translation.ugettext_lazy()
is deprecated in favor of django.utils.translation.gettext_lazy()

jaredly/django-colorfield,jaredly/django-colorfield,jaredly/django-colorfield