One day I got tired of guessing the names of my Seljuk cities as the special characters simply got omitted in the settlement view and in the messages. So I sat down to make some CUF files to fix this.
Simply extract the download into the data folder of the SS6.4 directory (7Zip is freeware)
Example settlement display name, I have not managed to move the hyphen after the name, but that is certainly better then having no special characters at all.