This solution has been translated is one approach to solve the problem with fictional languages. Worldbuilders often wish to include multiple fictional languages in a single world. Afterall, it might not be realistic that every single civilization and alien species speaks English. Inserting universal translators, translation spells, or other means by which individuals can understand one another preserves the languages and adds a reasonable explanation for how these different factions understand one another. Another similar solution is the insertion of a common tongue.