Hello Gegard,

I did so for my amplifer model (S-series). After installing the software:
Open the file Minas-s.def (C:\Program Files\PANATERM\ini\def) via Notepad++ and find this lines ##194, 195, 196 and make the change of the points to commas and add quotation marks.
Save. Start Panaterm again.
See pictures.

Regards,
Andrey

P.S.Now I think that this can be done in another way.
Windows Control Panel - language and regional standards -additional parameters - Setting format and to add a point.
Hopefully this will help you!