A kind forum member at that website sent me the software that is apparently used for changing the fonts. Tadad1, are you interested in having a look at it and trying to make some sense of it all? From what I can see all it does is take a BMP file (with characters in it) and resizes it and produces a file with the coordinates of the letters, and it also has some flashing feature. Interestingly, the folder included some images of all the icons, as well as the main menu screen that I have (although very slightly different) Here is a screenshot of the program and the other files that came with it:
