A- stem Aorists do keep their a endings. I will pay more attention.
So "I tengwar Eldarin": "The laguage/letters are Elvish"
"Yįra lé": an ancient manner/method/way
"Apa": but
"i lambė i Mordoro": The tongue is of Mordor
"Ita": that which, which
"Sinomė": here, this place
"vįquetuvan": I will not speak
And if I put all that together: The language is Elvish, an ancient method, but the tongue is that of Mordor which I will not speak in this place.
And if you like memes, this one is relevant: