feat(i18n): update Finnish translations

Currently translated at 30.6% (85 of 277 strings)

Co-authored-by: Nipatsu <nipatsuplaying@gmail.com>
Translate-URL: https://hosted.weblate.org/projects/discord-tickets/bot/fi/
Translation: Discord Tickets/Bot

src/i18n/fi.yml

@@ -89,6 +89,8 @@ commands:
     claim:
       description: Varaa tiketti
       name: varaa
+      not_staff:
+        title: ❌ Virhe
     new:
       description: Luo uusi tiketti
       name: uusi