Translation of a poem?

Hello,

I'm discovering a poem by Percy Bysshe Shelley, and I'd like to translate it into French (to understand it, because I speak French)

Music, when soft voices die,

Vibrates in the memory,

Odours, when sweet violets sicken,

Live within the sense they quicken.

Rose leaves, when the rose is dead,

Are heaped for the beloved's bed;

And so thy thoughts, when thou art gone,

Love itself shall slumber on.

So I made a translation:

La musique, quand les douces voix meurent,

Vibre dans le souvenir,

Les odeurs, quand les violettes parfumées écoeurent

Vivent dans leur intensité.

Les feuilles de la rose, quand la rose meurt,

Sont rassemblées sur le lit du bien-aimé,

et par tes pensées, quand tu seras parti(e)

l'Amour lui-même y sommeillera.

It's not easy to translate a poem from a language to another, but I don't know what words to delete. (sorry for this broken English).

Thank you for your help!