--- a/mercurial/manifest.py	Tue Jun 07 12:10:01 2016 +0200
+++ b/mercurial/manifest.py	Tue Jun 14 11:53:55 2016 +0200
@@ -968,7 +968,7 @@
             return self.readdelta(node)
         if self._usemanifestv2:
             raise error.Abort(
-                "readshallowdelta() not implemented for manifestv2")
+                _("readshallowdelta() not implemented for manifestv2"))
         r = self.rev(node)
         d = mdiff.patchtext(self.revdiff(self.deltaparent(r), r))
         return manifestdict(d)