Add Italian UI translation support (it-it)

[daniloctdev]

Summary

• Adds Italian (it-it) UI translation resources for Harbor.
• Scope is limited to localization assets only (no functional code changes).

Validation

• Branch italian-ui-translation-it-it pushed to fork and ready for review.
• Change set reviewed to ensure only translation content is included.

Related

• Website docs translation PR: Translate Harbor website docs to Italian website#719

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.01%. Comparing base (4cedb8c) to head (cbac384).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23160      +/-   ##
==========================================
- Coverage   66.03%   66.01%   -0.02%     
==========================================
  Files        1074     1074              
  Lines      116715   116715              
  Branches     2941     2941              
==========================================
- Hits        77069    77048      -21     
- Misses      35374    35394      +20     
- Partials     4272     4273       +1     

Flag	Coverage Δ
unittests	66.01% <ø> (-0.02%)	⬇️

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Files with missing lines	Coverage Δ
src/portal/src/app/shared/entities/shared.const.ts	100.00% <ø> (ø)

... and 11 files with indirect coverage changes

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