Fixed #19272 -- Fixed gettext_lazy returned type on Python 2

Thanks tyrion for the report.

django/utils/translation/trans_real.py

@@ -246,7 +246,8 @@ def do_translate(message, translation_function):
     """
     global _default
 
-    eol_message = message.replace('\r\n', '\n').replace('\r', '\n')
+    # str() is allowing a bytestring message to remain bytestring on Python 2
+    eol_message = message.replace(str('\r\n'), str('\n')).replace(str('\r'), str('\n'))
     t = getattr(_active, "value", None)
     if t is not None:
         result = getattr(t, translation_function)(eol_message)

tests/regressiontests/i18n/tests.py

@@ -83,6 +83,10 @@ class TranslationTests(TestCase):
         s4 = ugettext_lazy('Some other string')
         self.assertEqual(False, s == s4)
 
+        if not six.PY3:
+            # On Python 2, gettext_lazy should not transform a bytestring to unicode
+            self.assertEqual(gettext_lazy(b"test").upper(), b"TEST")
+
     def test_lazy_pickle(self):
         s1 = ugettext_lazy("test")
         self.assertEqual(six.text_type(s1), "test")