Customize Odoo Point of Sale to use SP-specific terminology

[kneckinator]

The following changes should be done either in spp_pos (https://github.com/OpenSPP/openspp-modules/tree/17.0/spp_pos), in spp_id_redemption (https://github.com/OpenSPP/openspp-modules/tree/17.0/spp_pos_id_redemption) or in the customer repo (https://github.com/OpenSPP/openspp-customer).

As long as the changes are generic, such as using "Beneficiary" instead of "Customer", I believe they could go in either spp_pos or spp_pos_id_redemption. For each item, the suggested component is indicated.

• [x] Replace the button label "Customer" with "Beneificiary" in the Odoo Point of Sale screen where you search for customers (spp_pos)
• [ ] When a QR/Barcode is scanned in the "Customer" pop-up screen in Odoo Point of Sale, any currently selected customer should be unselected automatically (spp_pos)
• [x] Remove payment options and cleanup payment screen when redeeming entitlements (spp_pos_id_redemption). The remaining option should be "Cash"
• [ ] Replace the button label "Payment" with "Redemption" in the Odoo Point of Sale (spp_pos_id_redemption)