Way is change file "lib/classes/class.content.inc.php" ... after line 341 ("$alias = trim($this->mMenuText);") put:
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#Change letters with diacritic
$badletters = array("ľ", "š", "č", "ť", "ž", "ý", "á", "í", "é", "ú", "ä", "ô", "ň", "ď", "ů", "ř", "ě");
$goodletters =array("l", "s", "c", "t", "z", "y", "a", "i", "e", "u", "a", "o", "n", "d", "u", "r", "e");
$alias = strtolower(str_replace($badletters, $goodletters, $alias));