Thanks a lot for the translation(s). It is realy a beautiful song (also the melody, very Neapolitan).
About 'standard Italian', it was the dialect of Alighieri Dante (Tuscan indeed) who became the standard language due to his cultural
prestige with autors like Dante, Boccaccio and Petrarca (13th century). Before these period, it was the ... Sicilian dialect that was spoken by the higher classes in what is now Italy when Sicily was at his cultural and political apogee (12th century).
Also, there are more than 200 italian dialects and about 15 non-italian languages like Albanian, Greek, Frioulan, Ladin,...
are spoken by historical minorities in Italy!