[I18N] Add new translations for italian strings

[cmassi]

@RocketChat/ios
Please review italian translation for all the recently added strings

[rafaelks]

🙏 🇮🇹

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@932f7ea). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #2443   +/-   ##
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  Coverage           ?   25.98%           
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  Files              ?      448           
  Lines              ?    16823           
  Branches           ?        0           
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  Hits               ?     4371           
  Misses             ?    12452           
  Partials           ?        0

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