Index: sphinx/builder.py
===================================================================
--- sphinx/builder.py	(revision 65598)
+++ sphinx/builder.py	(working copy)
@@ -180,7 +180,7 @@
             if self.translator is not None:
                 self.info('ok')
             else:
-                self.info('selected locale not available' % self.config.language)
+                self.info('selected locale [%s] not available' % self.config.language)
         if self.translator is None:
             self.translator = gettext.NullTranslations()
         self.translator.install()