FEAT #17005 TIME 4 WIP customize the message in the login page

lang/fr.json

src/app/group/controllers/PrivilegeController.php

...administration/customization/customization.component.html

...administration/customization/customization.component.scss

...p/administration/customization/customization.component.ts

src/frontend/app/app-routing.module.ts

src/frontend/app/app.module.ts

src/frontend/app/login/login.component.html

src/frontend/app/login/login.component.scss

src/frontend/app/service/auth.service.ts