Pontoon: Update Bulgarian (bg) localization of MDN

Localization authors:
- k.berov <k.berov@gmail.com>

locale/bg/LC_MESSAGES/django.po

@@ -4,7 +4,7 @@ msgstr ""
 "Project-Id-Version: MDN 2016.0\n"
 "Report-Msgid-Bugs-To: dev-mdn@lists.mozilla.org\n"
 "POT-Creation-Date: 2017-03-20 13:40-0700\n"
-"PO-Revision-Date: 2017-03-27 22:58+0000\n"
+"PO-Revision-Date: 2017-03-28 18:08+0000\n"
 "Last-Translator: k.berov <k.berov@gmail.com>\n"
 "Language-Team: Bulgarian https://pontoon.mozilla.org/bg/\n"
 "Language: bg\n"
@@ -3629,7 +3629,7 @@ msgstr ""
 #: kuma/wiki/jinja2/wiki/translate.html:33
 #, python-format
 msgid "Translating article to %(locale)s"
-msgstr ""
+msgstr "Статията се превежда на %(locale)s"
 
 #: kuma/wiki/jinja2/wiki/translate.html:43
 msgid "Translate Content"