update-manager crashes at missing argument in translated string

[Pavol Klačanský]

dist: karmic
link: https://translations.launchpad.net/ubuntu/karmic/+source/update-manager/+pots/update-manager/sk/236/+translate

there is another possible translation instead "%s day ago" with "yesterday", but after that program crashes

jeremi@jeremi-laptop:~$ sudo update-manager
[sudo] password for jeremi:
Traceback (most recent call last):
  File "/usr/bin/update-manager", line 108, in <module>
    app.main(options)
  File "/usr/lib/python2.6/dist-packages/UpdateManager/UpdateManager.py", line 923, in main
    self.fillstore()
  File "/usr/lib/python2.6/dist-packages/UpdateManager/UpdateManager.py", line 772, in fillstore
    self.update_count()
  File "/usr/lib/python2.6/dist-packages/UpdateManager/UpdateManager.py", line 497, in update_count
    if self._get_last_apt_get_update_text() is not None:
  File "/usr/lib/python2.6/dist-packages/UpdateManager/UpdateManager.py", line 473, in _get_last_apt_get_update_text
    ago_days) % ago_days
TypeError: not all arguments converted during string formatting