fix(module:i18n): update it_IT.ts

[gabrielemilan]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[X] Other... Please describe: Italian translations update

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[X] No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #7646 (1acbad6) into master (92be537) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7646   +/-   ##
=======================================
  Coverage   92.02%   92.03%           
=======================================
  Files         502      502           
  Lines       16736    16736           
  Branches     2629     2629           
=======================================
+ Hits        15402    15403    +1     
  Misses       1064     1064           
+ Partials      270      269    -1     

Impacted Files	Coverage Δ
components/core/util/text-measure.ts	92.10% <0.00%> (-0.88%)	⬇️
components/tabs/tab-nav-bar.component.ts	87.94% <0.00%> (+0.70%)	⬆️

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[wenqi73]

LGTM