Merge pull request #50155 from lucab85/i18n-Italian

Automatic merge from submit-queue (batch tested with PRs 46986, 51214, 51169, 50155, 51261)

Add Italian translation for kubectl

**What this PR does / why we need it:**
This PR provides first attempt to translate kubectl in Italian (related to #40645, #45573,
#45562, #40591, #46559).

**Which issue this PR fixes** _(`optional, in fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)_: fixes #
No issues

**Special notes for your reviewer:**
This PR requires Italian people to assist in the review. I'm native in Italian with BS in Computer Science.

```release-note
Adding Italian translation for kubectl
```

pkg/kubectl/util/i18n/i18n.go

@@ -38,6 +38,7 @@ var knownTranslations = map[string][]string{
 		"zh_CN",
 		"ja_JP",
 		"zh_TW",
+		"it_IT",
 	},
 	// only used for unit tests.
 	"test": {