Complete translations for IT language and remove unused keys

[Martinocom]

• https://github.com/Martinocom/MoneygerApp/commit/01aef7878200d0cc6e077916fbd468fb06f2c544
• https://github.com/Martinocom/MoneygerApp/commit/532328a7f6d0e4fc352facf8febb668b0ca6111b