Enable HStore extension for localized fields to work

localized_fields/migrations/0001_initial.py

@@ -0,0 +1,14 @@
+# Generated by Django 2.1 on 2018-08-27 08:05
+
+from django.contrib.postgres.operations import HStoreExtension
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+    ]
+
+    operations = [
+        HStoreExtension(),
+    ]