Fixing bug #89098 (Date not localized in What's Up Tonight tool).

Fixing bug #89098 (Date not localized in What's Up Tonight tool).
This is part one of a two-part fix.  ExtDate used to use Qt's format strings for expressing dates.  However, to localize the expression of the date, we need KGlobal::locale()->dateFormat(), which uses KDE's format strings (which are totally different from Qt's).  This commit makes ExtDate and ExtDateTime use KDE format strings.

CCMAIL: kstars-devel@kde.org

svn path=/trunk/kdeedu/libkdeedu/; revision=347759