I am sorry that my French is too weak to respond with anything useful.
The Project lead is a single person who owns the project.
The Project administrator's role is for allowing people to administrate the project.
It is quite common to have a permission scheme that says "the project lead has admin rights", so that the owner is automatically an administrator without needing to be added to the admin role.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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