#13 Parse Date in restore tab

[Sylvain Lequeux]

In the restore tab, the second column of the save history contains the date of each archive.
This date must be parsed in the UI. Use a date format depending on the OS locale (see Qt::SystemLocaleShortDate or Qt::SystemLocaleLongDate in http://qt-project.org/doc/qt-4.8/qt.html#DateFormat-enum)