The manual says this but I don’t find such a menu item under “Library” (I’m running version 6.1.10.6078):
Changing the language for instrument names
You can change the language used for instrument names; for example, if you want to recreate a French score. This affects staff labels and instrument change labels.
Procedure
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Choose Library > and then Project Language to open the Project Language dialog.
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Select the language you want to use from the Instrument names language menu.
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Activate/Deactivate Reset instrument names.
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Click OK to save your changes and close the dialog.