doap: add <programming-language>
doap: add <programming-language>

Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,Tarnyko/rygel,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched