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.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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