Not all the languages we come across in LotR are supposed to be translations. The Elvish languages are, wherever encountered, the 'real' Elvish languages. The only languages that are 'translations' are the real-world languages. So, English is Westron, Old English is Rohirric, and Old Norse is the language of northern Rhovannion; but Quenya is Quenya and Sindarin is Sindarin.
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