Fix translatable source string using “silenced” instead of “limited” (#31822)

config/locales/en.yml

@@ -25,7 +25,7 @@ en:
   admin:
     account_actions:
       action: Perform action
-      already_silenced: This account has already been silenced.
+      already_silenced: This account has already been limited.
       already_suspended: This account has already been suspended.
       title: Perform moderation action on %{acct}
     account_moderation_notes: