Hi, I hope you won't mind me making a few suggestions :)
'Plus de passé': 'No more past'
'Quand l'espérance oubliée, dissolue': 'When hope is forgotten, dissolute'
'Quand les alcools même ne saoulent plus': I would have said 'When even alcohol doesn't (can't) get me drunk anymore', but your version is correct too.
'Restent les phrases écorchées': 'écorché' is stronger than just 'scratched', so I'd suggest 'Remain the tormented phrases (sentences)'.
'Dans l'autre realite': 'In the/that other reality'
'We will be princes of the eternity': 'We will be the princes of eternity'
'A ray of sun randomly': 'A random ray of sun', maybe?
'Ce que les autres ont laissé de côté: 'That others have left behind/put aside'
'Nothing rests but these phrases like islands with treasures': 'Remains nothing but these phrases like treasure islands'?
This work has been done by Alma Barroca. In case you want to use it elsewhere, please ask for permission - if given, my name must be always mentioned as the author. If I find my works being reprinted without permission I will request for it to be removed.