Added italian translation (#351)

* Update to italian translations

* Update to italian translation - half to go

* Update to italian translation

* Update to italian translation

* Update to italian translation

* Update to italian translation

* Update to italian translation - end initial translation

* finalized italian translation

* Update: changed translation of 'invoice' from 'fattura' to 'richiesta di pagamento'

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Co-authored-by: FiliTol <filippotolin@protonmail.com>
Co-authored-by: First-Terraner <40151034+KKA11010@users.noreply.github.com>