When JConsole is started in Japanese or Chinese language:

% jconsole -J-Duser.language=ja
% jconsole -J-Duser.language=zh -J-Duser.country=cn

The following notificaiton-related button captions are not translated at the MBean tab:

"Subscribe", "Unsubscribe", "Clear"

It seems there are problems with resources file, because these strings are translated in the localized resource files.