Related Questions:
Can I update the names on an Invoice?
Customize Component Labels
Can my Invoice be in a different language?
Procedure:
Within Invoice Settings, customized Component Labels allow you to modify names of various Invoice headings and subjects. This can be used to change the wording, including languages other than English.
The default labels will display unless you enter an alternative label name in the empty field.
To update these labels,
On the left-hand side go to Settings
Click on Organization and then Invoice Settings
Customize Component Labels in the empty fields as needed
Save your work