Laserschwert said:

Who made the international crawls anyway? Was it ILM themselves?

As I understand it and what I have read through the years, the international crawls were all done by ILM, so I guess the pattern for updates should be the same as the US releases:

STAR WARS

1981: The opening scene was redone with a new crawl.

1997: Crawl and opening scene was redone, logos along with the preface - A long time ago... was remade.

2004: The preface - A long time ago... was remade.

The Empire Strikes Back

1997: Logos were updated.

2004: The preface - A long time ago... was remade.

The Return Of The Jedi

1997: Logos were updated.

2004: The preface - A long time ago... was remade.

13 International versions of the crawl and preface was also created for the 2004 DVD release according to DVD producer Van Ling.

Edit: Sorry, I saw in the Schnittberichte-links you provided that the updates for the German releases doesn't match the US releases.