added it locale, added it entry

[gekoxyz]

added the italian translation by adding the /interface/locales/it/common.json file and the entry in settings.json and general.tsx

this helps More languages support #1820

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[utkubakir]

Thank you for your contribution! There should be 424 keys total, you might wanna update your branch

[gekoxyz]

in my opinion @mercxry suggestions seem really good, they improve a lot of wording and add the keys which were added while i was finishing the translation.

[utkubakir]

@gekoxyz I committed the suggestions in, I believe there are still some keys missing. Can we add those too so we can merge this pr?