Custom label for "Markup" (for example "Purchasing Fee")

Echo's firm is in British Columbia. Under BC PST, calling a charge "markup" means the item is resold and changes the tax treatment, so her contracts bill a percentage "purchasing fee" instead. Today she removes markup on every item and adds a manual "20% purchasing fee" line at the bottom of each invoice.

Requested: an account-level setting to rename "Markup" everywhere it appears (library, clipper, estimates, invoices) so she can use it as her purchasing fee and have it calculate automatically. Default stays "Markup" for everyone else.

Before building: check with the Vancouver user whether they handle purchasing fees the same way, and assess how complex the rename is across the system.