Made moderation mail subject translatable

Fixes #68. Thanks dlancer for the report.

@@ -6,7 +6,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Django\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2015-06-22 17:28+0200\n"
+"POT-Creation-Date: 2016-02-10 09:06+0100\n"
 "PO-Revision-Date: 2012-02-14 13:24+0000\n"
 "Last-Translator: Jannis Leidel <jannis@leidel.info>\n"
 "Language-Team: English <en@li.org>\n"
@@ -214,6 +214,11 @@ msgstr "comment flag"
 msgid "comment flags"
 msgstr "comment flags"
 
+#: moderation.py:253
+#, python-format
+msgid "[%(site)s] New comment posted on \"%(object)s\""
+msgstr ""
+
 #: templates/comments/approve.html:4
 msgid "Approve a comment"
 msgstr "Approve a comment"

@@ -63,6 +63,7 @@ from django.core.mail import send_mail
 from django.db.models.base import ModelBase
 from django.template import Context, loader
 from django.utils import timezone
+from django.utils.translation import ugettext as _
 
 import django_comments
 from django_comments import signals
@@ -249,8 +250,10 @@ class CommentModerator(object):
             'comment': comment,
             'content_object': content_object,
         }
-        subject = '[%s] New comment posted on "%s"' % (get_current_site(request).name,
-                                                       content_object)
+        subject = _('[%(site)s] New comment posted on "%(object)s"') % {
+            'site': get_current_site(request).name,
+            'object': content_object,
+        }
         message = t.render(Context(c) if VERSION < (1, 8) else c)
         send_mail(subject, message, settings.DEFAULT_FROM_EMAIL, recipient_list, fail_silently=True)