Fixed #6106 -- Prevented makemessages from changing .po files when up to date.

Co-authored-by: Daniyal Abbasi <abbasi.daniyal98@gmail.com>

tests/i18n/unchanged/__init__.py

@@ -0,0 +1,4 @@
+from django.utils.translation import gettext as _
+
+string1 = _('This is a translatable string.')
+string2 = _('This is another translatable string.')

tests/i18n/unchanged/locale/de/LC_MESSAGES/django.po.tmp

@@ -0,0 +1,26 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: PACKAGE VERSION\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2014-04-25 15:39-0500\n"
+"PO-Revision-Date: 2014-05-25 15:39-0500\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#: __init__.py:3
+msgid "This is a translatable string."
+msgstr "And this has been translated."
+
+#: __init__.py:4
+msgid "This is another translatable string."
+msgstr "And this also has been translated."

tests/i18n/unchanged/models.py.tmp

@@ -0,0 +1,3 @@
+from django.utils.translation import gettext as _
+
+string3 = _('This is a hitherto undiscovered translatable string.')