Where is collect location of gtk20.mo on Windows?

[TAKAHASHI Kaoru]

I have installed gnubg-1_08_001-20240204-setup.exe to
%HOMEPATH%\AppData\Local\gnubg\.

And execute following gnubg command:
  set lang ja_JP.UTF-8
  set toolbar 2

No translated New, Open, Save and Edit on toolbar. (GTK_STOCK_*)
Other toolbar icon was translated. (GNUBG_STOCK_*)
Reproduced on Linux after "mv /usr/share/locale/ja/LC_MESSAGES/gtk20.mo /tmp/".


I'll put gtk20.mo my local Windows environment.
But I don't know where to put gtk20.mo correctly.

I have tried the following directories:
  %HOMEPATH%\AppData\Local\gnubg\locale\ja\LC_MESSAGES\
  %HOMEPATH%\AppData\Local\gtk-2.0\locale\ja\LC_MESSAGES\
  %HOMEPATH%\AppData\Local\gtk-2.0\share\locale\ja\LC_MESSAGES\

Where is collect gtk20.mo location on Windows?
-- 
TAKAHASHI Kaoru