One product, many customers: per-customer translations with tenants, a worked example

White-label and B2B products often need the same app with each customer’s own wording: “client” instead of “patient”, a different cancellation policy, the customer’s name instead of yours. The ways teams handle it (copies, custom locale codes, namespaces, interpolation, tenant projects), and a real run with one base project and three customer tenants: overrides, what happens when the base changes, how the app loads the right customer, and what to watch.