install gettext in CI

.github/workflows/ci.yml

@@ -69,6 +69,7 @@ jobs:
           python manage.py compress
       - name: 🚧 compile translations
         run: |
+          sudo apt-get install -y gettext
           python manage.py compilemessages
       - name: 🚧 Check pending migrations
         run: python manage.py makemigrations --check --dry-run --noinput