I doubt that "talking" about Nazism would be
illegal. It's "promoting"
it that would be illegal. One also has to consider that there are other
German speaking countries, like Switzerland. If this is a serious
problem, rather than an imaginary one based on sombody's
misunderstanding, one could create an intermediate boilerplate page
containing something like the following:
Of course it is not illegal to talk about Nazism. Even "promoting" them is not
illegal in most cases. But for example its illegal to lie about the holocaust
or use some of (the old) symbols (for example the Hakenkreuz) for "promoting"
Nazism. That means for example it is illegal to stick these symbols on you
clothes.
Since Wikipedia has one rule, called NPOV, there never will be a problem with
that, cause it is allowed to write "who lies about the holocaust" (we ourself
would never lie about, just talking about these lies). It even is allowed to
have pictures with the "Hakenkreuz" since it is allowed to show them for
example in an educational context.
Ivo Köthnig