You need Linuxconf's sources. The translation is handled in the messages subdirectory. Get the sources and compile Linuxconf. This is needed because the translation utilities are delivered with Linuxconf.
You should read the document translate/translat.doc. It explains the technology used to make Linuxconf translatable. This should save you a lot of time and make the tracking of the various new Linuxconf release a lot more easier than anything else.
Translating Linuxconf involves two different operation. You must translate all messages use by Linuxconf itself and then translate all the help screens.