1) Pseudocode $(r_) added - ring above the character - have a look into
 codepage definition files for the translator module.
2) The English name for that "accent 'v' used in Slovenian/Croatian" (in Czech
 and Slovak as well) is 'caron'
3) Several charsets exist for the Czech language (similarily to other languages
 in central and eastern Europe). In fact, I can remember at least 6 different
 ASCII based charsets that are (more or less) still used on 16-bit (or higher)
 computers up to this time for the Czech language. The most important ones 
 (read: those you should support as well) are: CP895 (brothers' Kamenicky; most
 Czech programs running under DOS use this), CP852 (PC Latin-2; charset defined
 by IBM for this area and used in national language support in DOS and OS/2
 - many people don't like it, but most localized DOS programs use this), CP1250
 (defined by Micro$oft for use in MS Windows; they had probably thought it must
 be boring for us to have only 3 charsets for the Intel world ;-)) and finally
 ISO-8859-2 (ISO Latin-2; used in the Unix world, the standard for Internet
 transmission).
4) Please note as well, that there are currently two different country codes
 for our small country. :-) The first one is 042, which was used for former
 Czechoslovakia, the second one is 421, which is used in newer versions of
 OS/2 to differentiate between Czech Republic and Slovak Republic (maybe
 Microsoft uses it as well in newer versions of its operating systems, but
 I don't know this, because their latest products I use are MS-DOS 5.0 and
 MS Windows 3.1).