> I noticed that in all inquisit experiments the experiment starts with a request to enter the subject ID and the group number.
This is only true when you run an experiment in Inquisit Lab. When using Inquisit Web, you have a number of other ways to determine subject and group numbers (e.g. randomly).
> 1. Is there an option to cancel these questions (or at least the group question)?
No. Inquisit needs those ids to do condition assignment. If you don't need the groupid for that purpose in your particular experiment (because there are no between-subjects conditions), just leave it at the default value (1).
What you can do, it start your script via the command line and directly supplying the necessary parameters (group and subject id). Then there'll be no additional prompt. You'll find that covered in the "How to Launch Inquisit Using Command Line Parameters" topic in the Inquisit documentation.
> 2. Is there an option to edit them, and specifically - to present them in a different language?