gnome-panel-2.26.0/applets/clock
clock-location-tile.c
612: line4 = g_strdup_printf (_("Sunrise: %s - Sunset: %s"),
weather_info_get_sunrise (info),
weather_info_get_sunset (info));
I suggest some logic to format the string
I have found the easiest way to achieve this is to use nautlius-actions
sudo apt-get install nautilus-actions
nautilus-actions-config
then configure to taste for example:
Label: Add to Playlist
Icon: gtk-add
Path: totem
Parameters: --enqueue %M
Filenames: *.mp3 ;
Appears if selection has mutiple