diff -r 964a72038bb0 -r 8083f4d00bd1 mercurial/dispatch.py
--- a/mercurial/dispatch.py	Tue Jun 21 15:38:10 2011 +0300
+++ b/mercurial/dispatch.py	Tue Jun 21 18:35:13 2011 +0200
@@ -267,8 +267,8 @@
                     elif int(m.groups()[0]) <= len(args):
                         return m.group()
                     else:
-                        ui.debug(_("No argument found for substitution "
-                                   "of %i variable in alias '%s' definition.")
+                        ui.debug("No argument found for substitution "
+                                 "of %i variable in alias '%s' definition."
                                  % (int(m.groups()[0]), self.name))
                         return ''
                 cmd = re.sub(r'\$(\d+|\$)', _checkvar, self.definition[1:])