Include the comma in the translation (GoogleCloudPlatform#1787)

Author: engelke

translate/cloud-client/quickstart_test.py

@@ -20,4 +20,4 @@
 def test_quickstart(capsys):
     quickstart.run_quickstart()
     out, _ = capsys.readouterr()
-    assert u'Привет мир!' in out
+    assert u'Привет, мир!' in out