Members screens - traduction

I have a site in french langage. Site language is set to French. All wix development screens are in french.
I have members with different authorities.
Member login screen is customized and in french (same for suscribe)
When a user is logged with say level 1 authority and try to go to a page requesting level 2, there is a standard message window saying somehting like “You do not have the permission to access this page”. This message is like a promotional window, no problem, but in english, not in French.
Is this page customisable/translatable. Where can I find it?

Product:
[Which editor or feature is your question most relevant to? e.g. Wix Editor, Wix Studio Editor, Editor X.]

What are you trying to achieve:
[Explain the details of what you are trying to achieve. The more details you provide, the easier it is to understand what you need.]

What have you already tried:
[Share resources, forum topics, articles, or tutorials you’ve already used to try and answer your question.]

Additional information:
[Include any other pertinent details or information that might be helpful for people to know when trying to answer your question.]

In the meantime, I have seen in the members data that in the “private members data”, there is a field named “Langage” and set to ‘en’. This field is not updatable !!! I do not know its origin, but can confirm that in the parametrisation of the site everything is set to French.
Any idea ?