Remove uses of django.utils.translation.ugettext

This is just an alias of django.utils.translation.gettext on Python 3,
and it's deprecated starting Django 3.0.

dmoj/settings.py

@@ -13,7 +13,7 @@
 import os
 import tempfile
 
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django_jinja.builtins import DEFAULT_EXTENSIONS
 from jinja2 import select_autoescape
 

dmoj/urls.py

@@ -7,7 +7,7 @@
 from django.templatetags.static import static
 from django.urls import path, reverse
 from django.utils.functional import lazy
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.views.generic import RedirectView
 from martor.views import markdown_search_user
 

judge/utils/problems.py

@@ -70,7 +70,7 @@ def _get_result_data(results):
     return {
         'categories': [
             # Using gettext_noop here since this will be tacked into the cache, so it must be language neutral.
-            # The caller, SubmissionList.get_result_data will run ugettext on the name.
+            # The caller, SubmissionList.get_result_data will run gettext on the name.
             {'code': 'AC', 'name': gettext_noop('Accepted'), 'count': results['AC']},
             {'code': 'WA', 'name': gettext_noop('Wrong'), 'count': results['WA']},
             {'code': 'CE', 'name': gettext_noop('Compile Error'), 'count': results['CE']},

judge/views/blog.py

@@ -3,7 +3,7 @@
 from django.http import Http404
 from django.urls import reverse
 from django.utils import timezone
-from django.utils.translation import ugettext as _
+from django.utils.translation import gettext as _
 from django.views.generic import ListView
 
 from judge.comments import CommentedDetailView