yes, for those apps you will have to install some specific language packages
but kde is different: installing the corresponding i18n package (internationalization=i+18 letras+n) and choosing your language in the KDE Control Center will do the job
you can even make an icon to appear next to the clock, allowing you to set keyboard layout and other international features
don't know if you updated your kde version, but the official german package at ftp.suse.com (kde version=3.3.0) is ftp://ftp.suse.com/pub/suse/i386/9.2...2.1.noarch.rpm
or just select "kde3-i18n-de" via YaST
espero que te sirva de ayuda
Regards from Spain
P.S.: as Oscar Wilde said, "das Leben ist zu kurz, um Deutsch zu lernen"