Simplify item_tag not_found message

Drop the "switch organization" hint — Free client v2 has no
Organizations tab, so the guidance is misleading.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dadachi

config/locales/en.yml

@@ -55,7 +55,7 @@ en:
       accounts_shopkeepers:
         require_non_personal_account: "Require non personal organization."
       item_tags:
-        not_found: "Whoops, we weren't able to find this item tag. You may need to switch to another organization. Go Organizations tab."
+        not_found: "Whoops, we weren't able to find this item tag."
 
   shopkeeper:
     notification_mailer: