Small menu labels usability improvement

[haarp]

Hi again,

just a tiny usability suggestion this time.

The menu offers three options, Join Channel, Close and Disconnect. It's not entirely clear what "close" does. I hit it a couple of times expecting the program to close, when in fact it leaves the current channel.

Imho a better label for this would be "Leave Channel", similar to "Join Channel" above it. For queries, it could be labelled "Close Query" instead.

Atomic still rocks! :)