I don't know the Italian, but here's how it appeared in Singing Together, 1977:

PEPPINETTA

Merry and sweet is Peppinetta,
Carolling all the long day through
(La la lie-ra, la, la, la,
lie-ra la, la, la, la, la, la, la, la, la, la,
La la lie-ra la la la, lie-ra la la la la la la
La la la la.}
Down by the shore at sun-down I met her,
Washing her nets as fisher-girls so,
Down by the shore at sun-down I met her
Washing her nets, as fisher-girls do
(La La etc)

All the day long for coral toiling,
Poor in her home beside the sea
(La la, etc)
Yet ne'er a frown her sweet face is spoiling,
Fair as a flow'r, contented is she,
Yet ne'er a frown her sweet face is spoiling
Fair as a flow'r , contented is she

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I may have m,iscounted the 'la's!