The portal does not use UTF-8, it uses cp1250. 
$ perl -E 'print "Ka\x9eim\xedr"' | iconv -f cp1250 -t utf8
Kažimír

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Percent encoding of URIs with UTF-8 characters by choroba
in thread Percent encoding of URIs with UTF-8 characters by reisinge

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