You did not get duplicated buttons you imported your buttons which were renamed so it just added them to your Calculation Selectors and Payment types. If you rename anything and them import them into a stock setup it will not replace it will just add them to it.
So it looks like you renamed Cash and Credit Card payment types to Effectivo and Tarjeta Credito and you attempted to use wrap command with the Tarjeta Credito payment type.
Also looks like you renamed Discount %
The buttons on the bottom are Calculation Selectors found under Tickets > Calculation Selectors
The buttons on the right are Payment Types located in Tickets > Payment Types
As for the Menu you can not export the menu using Database Tools you would need to use MSSMS to export it and script it into your new database. Example would be here: