Change the label to a scroll_label.

This is required to get the wrapping and scrolling working for the
dialog. (Note the code to do wrapping and scrolling doesn't work
properly yet. This will be fixed but is a much larger change.)

data/gui/default/window/message.cfg

@@ -368,10 +368,10 @@
 												border = "all"
 												border_size = 5
 
-												[label]
+												[scroll_label]
 													id = "message"
 													definition = "default"
-												[/label]
+												[/scroll_label]
 
 											[/column]