diff -r a8595176dd64 -r f247fbfe07f3 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Wed Mar 18 23:03:41 2015 -0400
+++ b/mercurial/localrepo.py	Fri Mar 20 16:39:07 2015 -0500
@@ -428,9 +428,9 @@
         store = obsolete.obsstore(self.svfs, readonly=readonly,
                                   **kwargs)
         if store and readonly:
-            # message is rare enough to not be translated
-            msg = 'obsolete feature not enabled but %i markers found!\n'
-            self.ui.warn(msg % len(list(store)))
+            self.ui.warn(
+                _('obsolete feature not enabled but %i markers found!\n')
+                % len(list(store)))
         return store
 
     @storecache('00changelog.i')