Languages are quite important in the Barbaric Frontier Campaign, since it's set in the eponymous frontier, where different cultures and nations interact.
Reichspiel - is the language of the Größe Reich, well it's a equivalent of late-medieval german language.
Barbaric Language - is the language of barbarians, sounds like gaellic.
Klassik - it's my campaign equivalent of Latin, it's a language of scholars and the Church of the One.
Zwergisch - it's a language of dwarfs, who live among humans of the Größe Reich.
Elven Language - pretty self-explanatory. Sounds like finnish.
Dwarven Language - as above. Sounds like icelandic.
Skrell - language of Skraeling savages, sounds like euskara(Basque language).
Halfling language - language of Halflings of the Größe Reich, sounds like dutch language.
Trade Speak - it's a lingua franca of my campaign world, not precisely a common language, but something that helps comunnicating with foreigners.