If you're talking about weapon-menu text, that uses a raw font and is inputted as literal text, not as an image. Only registered players can change the font.
I guess you could theoretically force it to be an image by stretching the int.-gfx and inputting text into the raw graphic itself, but I don't know if the image would dominate over the text when they collide, and either way you'd lose the feature of the text coloring itself green for chosen weapons.
You still want it? I think I could do it over the weekend; shouldn't take too long. What mod are you using, if any?