Add complete Italian translation (497 keys) based on PR #7 by
@albanobattistella. Fixed filename from "it. json" to "it.json" and
registered Italian in SUPPORTED_LOCALES and the locale picker component.
Co-Authored-By: albanobattistella <34811668+albanobattistella@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Ulas