Problem with language.

[kjxxxx]

Freespace 2 - GOG, Polish version
FS2 Open - 24.2.0
Knossos - 1.3.2
Other mods - none

Language in Knossos settings - set to Polish
Language in ini file - Polish

In-game: English text (menu, briefings, settings, etc), Polish voices.

How to change to Polish text?

It's strange because when I use:
Polish FS2 + FSOInstaller (jar) + wxLauncher
everything is OK. Polish text, Polish voices.

Problem with Knossos? Does not support Polish version?
Or maybe there is another settings to change language?