i accidentaly deleted previous post so im adding it back:
thanks for reply.
We are entering language specific characters, which should work anyways.
I have also tried turning off every filter, when request was called. It does not help.
One thing that would help us at this point is sending parameters along one unlocked property.
I don't think that was caused by our custom component, since I have created my own small component only with <form> that saves directly to JCR node and characters are still broken. When i add _charset_ it works. Isn't there another setting in AEM to set encoding?
Thanks for help