FUDforum's buttons contains translatable text.
Button templates (a bunch of *.xcf files) can be download from the project's SVN repository at https://fudforum.svn.sourceforge.net/svnroot/fudforum/trunk/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/<TEMPLATE-SET>/images).
|NOTE: Don't forget to share your new images with the community on the support forum so they can be inclded into subsequent releases.|