This poem has been translated many times into Elvish and it can be found on many sites... For example, I found this Sindarin translation at
www.elvish.org/gwaith --
Pân i valt law thilia,
Law pain i reviar mistar aen;
Iaur i vell law thinnatha,
Law thynd dyfn na-niss rathar aen.
O lith naur echuiathar aen,
Calad od dúath thuiatha;
Adamminen i vagol vreithannen,
Pen-thôl ad echannen i aran.
I am sure I also saw a Quenya translation somewhere... I`ll see if I can find it.