Merge branch 'container_foldername'

This patch set addresses #10313, providing localizable names of the current container foldername via the Container.Foldername infolabel.

I've done this by utilizing the label of the CFileItemList, setting it either in the directory classes (addons, videodb, musicdb) or directly by looking up the source name (files nodes) or by using GetTitleForPath.

diff --cc xbmc/Util.cpp
Simple merge

diff --cc xbmc/video/VideoDatabase.cpp
Simple merge

diff --cc xbmc/video/VideoDatabase.h
Simple merge