AFAIK, this is the only french THX laserdiscs with english soundtrack and text crawl of the original theatrical version of the trilogy. They have french subtitles in the bottom black bar for english and alien languages.
AFAIK, these LDs are only available in this black box with the red Star Wars logo and the Alvin art for ANH.
This box is rare and expensive!
AFAIK, two other box sets exists, an older one, black and in pyramidal shape, with only a silver french logo (La guerre des étoiles). This is the original theatrical version, but the picture quality is awful. And I don't know if a version with english soundtrack exists.
The other box set is THX, but it's the special edition. It has the mask of Darth Vader on it.
You may try to search for "coffret Star Wars" in the laserdiscs section of eBay France.
HTH.