[TYPO3-english] cooluri and non-latin encoding

[Historia]

Hello,

I have a site in Amharic and english, but cooluri doesn't show any link 
if it is in Amharic. I found a lot about asian websites with correct 
encoding, but it seems not to work with amharic.

If I switch to realurl I can enableAllUnicodeLetters and it shows then 
the link correct, but does not find a page.

Any idea what might be wrong?
cooluri 1.0.27
Typo3 4.5.5

Thanks Herbert