update ugettext_lazy as _ to gettext_lazy as _

teachers/admin.py

@@ -5,7 +5,7 @@
 from django.contrib.auth.admin import UserAdmin
 from django.contrib.auth.forms import UserCreationForm
 from django.contrib.auth.models import User
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.db.models import Sum
 from django.db.models.functions import Trunc