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late 13c., langage "words, what is said, conversation, talk," from Old French langage (12c.), from Vulgar Latin *linguaticum, from Latin lingua "tongue," also "speech, language" (see lingual). The form with -u- developed in Anglo-French. Meaning "a language" is from c.1300, also used in Middle English of dialects:
Mercii, þat beeþ men of myddel Engelond[,] vnderstondeþ bettre þe side langages, norþerne and souþerne, þan norþerne and souþerne vnderstondeþ eiþer oþer. [John of Trevisa, translation of Bartholomew de Glanville's "De proprietatibus rerum," 1398]Language barrier attested from 1933.
In oþir inglis was it drawin, And turnid ic haue it til ur awin Language of the norþin lede, Þat can na noþir inglis rede. ["Cursor Mundi," early 14c.]