Neither reserve nor reset work

Hi,

in my Drupal installation neither the userpoints_reserve nor the userpoints_reset work. Problem might be caused by the language. In both modules, under admin->settings->userpoints a field is shown, in which one is asked to type YES.
My installation runs with German though, and the field shows the letters NEI which are the first three letters of the German word for no. I tried typing in YES, yes, and ja but it never works.

The FIX: Just type in JA, in capital letters, and it works.

Best regards,
Ayshe