[ci skip] fix missing translation key

(cherry picked from commit daa026b2851e7e6ad9b191710a248d3a6f531303)

src/main/resources/i18n/strings.properties

@@ -162,6 +162,8 @@ hub.register.description=This is the first Hub access from this device. Please a
 hub.register.nameLabel=Device Name
 hub.register.invalidAccountKeyLabel=Invalid Account Key
 hub.register.registerBtn=Authorize
+### Register Device Legacy
+hub.register.occupiedMsg=Name already in use
 ### Registration Success
 hub.registerSuccess.message=Device registered
 hub.registerSuccess.description=To access the vault, your device needs to be authorized by the vault owner.