bookmarks: Use error message consistently

The 'updating bookmark %s failed!' message is better than
'failed to update bookmark %s'. To have more consistent error
messages we use just 'updating bookmarks %s failed'.

hgext/bookmarks.py

@@ -327,8 +327,8 b' def reposetup(ui, repo):'
                             if r:
                                 self.ui.status(_("updating bookmark %s\n") % k)
                             else:
-                                self.ui.warn(_("failed to update bookmark"
-                                                  " %s!\n") % k)
+                                self.ui.warn(_('updating bookmark %s'
+                                               ' failed!\n') % k)
 
             return result