feat(i18n): update Italian translations

Currently translated at 18.0% (50 of 277 strings)

Co-authored-by: Phil <me@criobits.me>
Translate-URL: https://hosted.weblate.org/projects/discord-tickets/bot/it/
Translation: Discord Tickets/Bot

src/i18n/it.yml

@@ -54,6 +54,7 @@ commands:
       options:
         member:
           name: partecipante
+          description: L'utente da aggiungere al ticket
         ticket:
           description: Il ticket dove aggiungere il membro
           name: ticket