Minimal working version

* Upgrade dependencies
* Fix ugettext
* Fix bad urls

com/models.py

@@ -26,11 +26,11 @@
 from django.shortcuts import render
 from django.db import models, transaction
 from django.db.models import Q
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.utils import timezone
 from django.urls import reverse
 from django.conf import settings
-from django.contrib.staticfiles.templatetags.staticfiles import static
+from django.templatetags.static import static
 from django.core.mail import EmailMultiAlternatives
 from django.core.exceptions import ValidationError
 

com/tests.py

@@ -27,7 +27,7 @@ from django.conf import settings
 from django.urls import reverse
 from django.core.management import call_command
 from django.utils import html
-from django.utils.translation import ugettext as _
+from django.utils.translation import gettext as _
 
 
 from core.models import User, RealGroup

com/views.py

@@ -28,7 +28,7 @@ from django.http import HttpResponseRedirect
 from django.views.generic import ListView, DetailView, View
 from django.views.generic.edit import UpdateView, CreateView, DeleteView
 from django.views.generic.detail import SingleObjectMixin
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.urls import reverse, reverse_lazy
 from django.core.exceptions import ValidationError
 from django.utils import timezone