Suggest a fix for Django 4.x

[hadi-f90]

Issue:

When I installed django-tellme, it couldn't do migrations. because of trying to import ugettext_lazy from django.utils.translation.

Apparent Cause:

It seems that, because of unicode compatibilty of python 3.x, the name gettext_lazy is used and does the same work.

My Solution:

So, I tried to change the imports in some files from ugettext_lazy to gettext_lazy to have the migrations get done.
They were in root directory of tellme named as:

• admin.py
• mail.py
• models.py

[Moring]

See #81