Hi Stefan,
this is an known bug (since HE beginning

).
Conversion from scan code to a sign and than to HTML done via xslt (data\syntax\syntax.xslt) to have it working as local as when uploaded to server.
And of course for xslt it is a hard task to take into account localization (let say current keyboard layout), and it is hardcoded to English layout (maybe with some German extensions, do not remember already). And because normally users assign shortcuts in English, nobody noticed, because most of the symbols match.
I can only make it working for local: do conversion manually, generate html manually, create temp file, then some when delete this temp file, because schema is loaded in external browser, it would not be possible then to preview the schema standalone and so on.
Too much effort, I would leave this like it is now. If somebody need exact values, he can check them inside of the hippoedit in keyboard options.
Best regards,
Alex.