fix(loyalty): missing i18n keys, wrong icon names in admin

- Add missing common keys: add, activate, copy, deactivate
- Fix icon: building-office → office-building (2 templates)
- Fix icon: pause → ban (pause not in icon set, ban used for deactivate)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/loyalty/locales/en.json

@@ -146,13 +146,17 @@
         }
     },
     "common": {
+        "activate": "Activate",
         "active": "Active",
+        "add": "Add",
         "all_stores": "All Stores",
         "at": "at",
         "back": "Back",
         "cancel": "Cancel",
         "confirm": "Confirm",
         "continue": "Continue",
+        "copy": "Copy",
+        "deactivate": "Deactivate",
         "delete": "Delete",
         "disabled": "Disabled",
         "edit": "Edit",