Hey guys!
I MADE IT!
It was my fault! I have not followed the guide like I should have and so
it was sure that it won't work. Here is what I found out (maybe there will be someone who has the same problems):
The easiest way to get a Shenmue 1 with japanese audio and english subtitles is to take the core of a NTSC-U or PAL version and inject the japanese audio stream into it. Then you "only" have to edit all those (hundreds of) subtitles because the notebook and the menus etc. are done already.
If you want to translate the subtitles according to this guide:
http://www.hiei-tf.fr/shenmue1-howto...e-english.html
you have to be carefull about this:
After translating the .srf files with AIO editor I always generated my new .afs file with afsutils like this:
Tools > AFS creator (inside the afsutils GUI) by adding the directory (f. e. A0114) instead of the .xml file (f. e. A0114_list.xlm)
I think that was the reason why the generated AFS file was corrupted and why it was not possible to create a valid idx file (and if the afs and idx are screwed up logically there won't be any audio and subtitles in the scene)
I am going to make a shenmue translation guide in pdf (based on this tutorial above with extra pictures and notes) and i'm gonna release it so that nobody has to waste his time on that kind of problem again.
I will also now continue my experiments with shenmue 1 translations to see whether it would be worth to make a modd or not and how much resources it would consume.
PS: About Sizious... I contacted him last year about the same issue but now as I found the solution he doesn't have to waste his time over that again ^^
I will write on sunday or saturday again!