Add index on allow_translation_propagation

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/migrations/0035_auto_20150630_1208.py

+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('trans', '0034_auto_20150618_1140'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='subproject',
+            name='allow_translation_propagation',
+            field=models.BooleanField(default=True, help_text='Whether translation updates in other components will cause automatic translation in this one', db_index=True, verbose_name='Allow translation propagation'),
+        ),
+    ]

weblate/trans/models/subproject.py

@@ -248,6 +248,7 @@ class SubProject(models.Model, PercentMixin, URLMixin, PathMixin):
     allow_translation_propagation = models.BooleanField(
         verbose_name=ugettext_lazy('Allow translation propagation'),
         default=True,
+        db_index=True,
         help_text=ugettext_lazy(
             'Whether translation updates in other components '
             'will cause automatic translation in this one'