Locale comma separating digit with Appimage

[Patrice.]

Hello,

OS Ubuntu-MATE 20.04

Today I downloaded the appimage of XnView MP, and I saw commas separating group of 3 digits for the Kib (I don't recall having seen it, because my settings were to see only the image name before I added this field)
.

screenshot_20240728-172030.jpg

.
The locale for it is good (en_US), but being a metric person (living in another country), I would like to have a space instead of a comma but keep the dot to separate the decimal.

Is there a setting for that? If so where I can find it?

Thanks for your time reading.

[xnview]

Do you have the problem with TGZ package?