Harmy's Despecialized Editions are AVCHD discs, which can't be played in a standard DVD player. You'll need either a Blu-ray player for playing on a TV, or a standard DVD-DL reader and a software like VLC to play them on a computer. See, AVCHDs are, by their structure, Blu-rays that hold on a DL-DVD, that's why a standard DVD player can't read them.

If you want to select the language, you'll have to press the "Language" button on your remote until you find it (as there's no menus, except on the 2.5 Blu-ray Harmy is about to release), but you'll have to add it first in Mkvmerge (aka Mkvtoolnix) and mux it to an AVCHD disc with TSMuxer.

Hope it helps.