How to sort categories by slug!

Hi,
I’m writing a page in Icelandic and having problems with sorting the categories in alphabetical order, because special characters lika Á, É, Ó, Æ og Þ all come before A, when á use sort_column=name…. is there any way to sort the categories by the category slug – that is the only way I’ve found to solve my problem!

I’ve also encountered the same problem when I sort authors in alphabetical order, but was able to solve that (although in a very crude way).

Any help is appreciated!

Cheers,
Aggi