subdomain module doesn't allow localised letters in group title

Hi

After enabling subdomain module and when I want to submit some open groups node with localizes title, I got this message for always:
Og's title can contain only letters, numbers and spaces
When I remove localized letters as e.g. ť č š ň č ô , etc, it works fine.
Please note that if checkbox "Restrict group names to letters and numbers" is checked or unchecked, doesn't matter, localizes letters in title are not acceptable for always. It is bug because pathauto have no problem with change localizes strings to basic letters as e.g. á - > a, ť -> t etc.

I attached here my pathauto localized string file, for your tests, just copy it into pathauto module directory if you have no inside it
(in pathauto directory there is this file with word "example" in its name by default, it is needed to have this file there with file name "i18n-ascii.txt")

thanks for your help
Igorik
http://www.somvprahe.sk