KDateTime shall be used only for storing date and time while KLocale
shall be used to display such, not even going to test what KDateTime
does because it is basically a few methods on top of QDateTime now.
and because QDateTime knows not much about calendar systems while
KLocale supports several it makes sense for KDateTime to not be used for
displaying date and time thus the TODOs for KLocale are simply removed
note that KLocale still uses its own parser and formatter which means
that the change affects only KDateTime and its uses, not KLocale
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>