The big combo box is not very usable, so as a first improvement,
move things around so that we can use a list on the left, and
put the examples on the right.
Also add a 'need logout' hint in the same style as on the
language tab.
setlocale() returns a string representing the _new_ locale, so
we have to get the current locale with setlocale (..., NULL) first,
and we have to copy it since it returns a static string that will
otherwise get overwritten.
