How to change Default status words for From sales order

Frappe Framework Customization
1

Is there any pythonic way to change the status word draft to waiting for approval in sales order

i have added new field order_status in sales order and set default values as Waiting for approval but when i save the doc i get draft on sales order

please screen shot of same

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2

Better to go for a workflow where you can create these statuses:

https://erpnext.org/docs/user/manual/en/setting-up/workflows