In addition, there is a Link ”?Join the WordPress translation team for Serbian (Latin)!” and it does not work.
I believe that there has been a conscious decision to cease Serbian Latin, but I would pay gold to understand WHY ? Since this is literally necessary to over 90% of website owners in Serbia!
While it is true that the official alphabet of the country (Serbia) is indeed in Cyrillic, it is also true that only about 5% website owners will opt for the Cyrillic option.