Hi! After you've added the 'GST' on
Hotcakes Taxes you can personalize the 'VAT' label working around views, for example to change it on checkout page you must edit the file in portalname/HotcackesViews/YourViewsName/Views/Checkout/Index.cshtml and work around this code
@Html.Raw(Model.CurrentOrder.TotalsAsTable())
otherwise for this view you can more simply edit GlobalResources.resx for your locale into portalname/HotcackesViews/YourViewsName/Views/App_LocalResources
If you change .resx files for your views remember to clear portal cache to see the modified value