You can use and read text in any channel including those as long as the channel was created as UTF8. Some networks allow that, some do not. Even if the network allows it, you have to create a new channel with the UTF8 name and move everyone to that channel. All major IRC clients support Unicode, so that is the better option as long as the network supports the channel name. Just get everyone to stop using the outdated codepages. If you really don't like that option, mIRC 6.35 works fine.
Also, this isn't a bug.
