Set backref labels

Fixes #6

ccdb/locations/migrations/0005_set_labels.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('locations', '0004_DATA_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='site',
+            name='region',
+            field=models.ForeignKey(blank=True, related_name='sites', null=True, to='locations.Region'),
+        ),
+        migrations.AlterField(
+            model_name='studylocation',
+            name='municipal_location',
+            field=models.ForeignKey(blank=True, related_name='study_locations', null=True, to='locations.MunicipalLocation'),
+        ),
+        migrations.AlterField(
+            model_name='studylocation',
+            name='site',
+            field=models.ForeignKey(related_name='study_locations', to='locations.Site'),
+        ),
+    ]