The spoken languages of Yugoslavia, which have always been used and are still used are Serbo-Croation, Slovenian, and Macedonian with them using the Vuk's Cyrillic alphabet for their written language. Children in school had to study one of these three languages. It was this way until 1990. 1990 the government opened the first Gypsy-language primary school.
Slavic peoples have either fair skin color and fair hair colored hair or are a darker tan color with darker hair just depending on the region you're from. For example my family members from Yugoslavia are Dinaric Types because they re from Croatia so they have blonde hair with white skin.