Buttons - fudforum/FUDforum GitHub Wiki
FUDforum's buttons contains translatable text.
Button templates (a bunch of *.xcf files) can be download from the project's GIT repository at https://github.com/fudforum/FUDforum/tree/master/optional/img
You need to install the GIMP image manipulation program to edit them. GIMP is available for Linux and Windows and can be downloaded free of charge from http://www.gimp.org/
After opening an *.xcf file, use the page-up and page-down keys to locate the layer with text. Click on the text tool (A-icon) and double-click on the text to change it. When done, save the image, export it as a *.jpg file and copy it into your theme's images directory (FUDdata/thm//images).
Note: Don't forget to share your new images with the community so they can be included into subsequent releases.