Serbo-Croatian

Serbo-Croatian
or
Bosnian-Croatian-Montenegrin-Serbian 
Spoken in Serbia, Croatia, Bosnia, Herzegovina, and Montenegro

Their translation of "May peace prevail on earth" is
Neka mirzavlada na zemliji

​On the U.S. Department of State's Foreign Service Institute exam, when listing which language competencies qualify for bonus points, when they list Serbo-Croatian they add "(All variants)."