And here it is, in English:
NADIR
What a turmoil within my whole being, at the sound of her voice!
What mad hope is this! How could I think I had recognized?...
Alas, before my poor insane eyes, already,
this same vision has too often floated by.
No, no, this is remorse, fever, madness!
Zurga must know everything! I should have told him all!
Breaking my troth, I tried to see her again;
I discovered her trail and I followed her;
hidden in the night and sighing under my breath,
I listened to her sweet chants borne away into space...
I think I can still hear,
hidden under the palm-trees,
her tender and sonorous voice
singing like a dove's.
O bewitching night,
exquisite rapture,
O delightful memory,
mad elation, sweet dream!
Under the light of the stars
I can almost see her
slightly opening her long veils
to the tepid evening breeze.
O bewitching night, etc.
Edited to add: I love Google.