tk fontchooser

This Tk command was added due to TIP#324 [1 ]

ZB What do you think about moving "OK" and "Cancel" buttons down, and place them horizontally, under "Effect"/"Sample" frames? Currently there's a whole lot of empty space on the right, due to buttons position.

DKF: The current dialog has rather a lot more wrong with it than that. (For example, it's localization is utterly botched, its usability is substandard and its key bindings are incomplete.) I think the best phrase to use is “not yet fixed”.