From Pluralpedia, the collaborative plurality dictionary
translator (n.)
Applies toheadmates

A translator is a headmate with the role of being able to efficiently translate for their fellow headmates and possibly others. Translators can be found in systems with headmates who speak in a foreign language, for example (but not limited to) Enderman or the Standard Galactic Alphabet. Translators may double as interpreters if presented with non-verbal or semi-verbal headmates.