Update common.vat Internationalization Config to update ADMIN/BACKOFFICE

[wesleypearson]

Describe the solution you'd like As a user based in Australia, I desire the ability to apply GST to transactions. For this purpose, I would like an update to the common.vat internationalization configuration, such that it accurately reflects the GST inclusion in the administration area.

Additional context https://share.cleanshot.com/4wddQSTPx8gfJ0qW8fJk https://share.cleanshot.com/1tNqYGxs9JbMTpmTG5t1 https://share.cleanshot.com/2KCLkQ49RyvlcDkWs73J