Update Italian translations for consistency

[fraluc06]

This pull request makes several improvements to the Italian localization (locales/it.json), focusing on correcting plural forms and refining some translations for clarity and consistency.

Localization improvements:

• Updated plural forms for several UI labels to use the correct Italian plurals, such as "Archiviati", "Preferiti", "Fissati", "Condivisi", and "Bloccati", instead of their singular forms. [1] [2]
• Improved the translation for "no messages" to be more natural: changed from "Nessun messaggio ancora" to "Ancora nessun messaggio".
• Clarified the description for camera upload settings to specify "caricamento dalla fotocamera" instead of "caricamento della fotocamera".