Fix #819

app/controllers/admin/users_controller.rb

app/models/user.rb

app/models/user/favorite.rb

app/models/user/with_favorites.rb

app/views/admin/application/favorites/_show.html.erb

app/views/admin/application/favorites/_widget.html.erb

app/views/admin/communication/extranets/show.html.erb

app/views/admin/communication/websites/show.html.erb

app/views/admin/dashboard/index.html.erb

app/views/admin/research/journals/show.html.erb

config/locales/en.yml

config/locales/fr.yml

config/routes.rb

db/migrate/20230614062545_create_user_favorites.rb

db/schema.rb

test/fixtures/user/favorites.yml

test/models/user/favorite_test.rb