Add scrolling="autooff" : same behavior as "auto" except that it starts in the soped state. Use that in the default skin.

Previously, it seems, the continuity counter was incremented freely and the masking was 
done when using the counter. This is ok, but every now and then some pids would reach 
the special "pid unused" value and spawn a spurious debug message, which shouldn't 
happen with this fix

wxwidgets/*: Readd the labels in the buttons. Should solve the l10n problems on win32. (Revert [14249]) (Refs #646)
po/*: Update the Po to reflect the changes.