sr_CS locale seems useless/outdated should be changed to sr_RS and sr_ME
Originally Czechoslovakia, later Serbia and Montenegro
Code taken from name in Serbian: Srbija i Crna Gora
Now divided into Montenegro (ME) and Serbia (RS)
CS previously represented Czechoslovakia (ccTLD .cs was never assigned to Serbia and Montenegro; .yu was the ccTLD of Serbia and Montenegro, as name was changed from Yugoslavia). Czechia uses (CZ) and Slovakia (SK)
glibc does not have such a locale either:
$ locale -a | grep ^sr sr_ME sr_ME.utf8 sr_RS sr_RS.utf8 sr_RS.utf8@latin sr_RS@latin $
On systems where there is no sr_CS locale, the compose file
cannot be used because one cannot set such a locale.
Probably there are no systems which have a sr_CS locale.
If that compose file is useful for Serbian, it should probably be moved (or at least copied or linked) to sr_RS.UTF-8/Compose. And sr_ME.UTF-8/Compose should then be created as well containing a line