Here's the translations of the elvish sentences in my poem. If you find errors, please tell me !!!

Ai Haldir o Lorien  i mòr erin le

Ah Haldir of Lorien the darkness is on you

Firich, tûr gwaith lîn ù-beria le

You die, the power of your people don't protect you

Tiro i gûr. Andelu i ven.

Look at the death. The path is very dangerous.

Arda = Elvish word for Middle-Earth.

Edhilion = Son of the Elves

Hiro hon hîdh ab 'wanath.

May he find peace after his death.

(adaptation of Legolas' words in  TTT when he cries over Merry and Pippin, after the encounter with the Rhorrim)