The "singular names" and "plural names" button of instrument does not work

[prko]

Hello,

The “singular names” button and the “plural names” button do not work.
The text in “Edit instrument names” window changes when clicking the buttons.
However, nothing is changed when clicking OK button.

I can change the name only by changing text directly.

[dspreadbury]

At the moment, Dorico only uses the singular names. In future the plural names will be used for section players.