extranet.domain -> host ; registration context in devise mailer

app/controllers/admin/communication/extranets_controller.rb

...ntrollers/concerns/users/add_context_to_request_params.rb

app/controllers/users/confirmations_controller.rb

app/controllers/users/passwords_controller.rb

app/controllers/users/registrations_controller.rb

app/controllers/users/sessions_controller.rb

app/mailers/devise_mailer.rb

app/models/communication/extranet.rb

app/models/user/with_authentication.rb

app/models/user/with_registration_context.rb

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

config/locales/communication/en.yml

config/locales/communication/fr.yml

...02322_rename_domain_to_host_in_communication_extranets.rb

db/schema.rb

test/fixtures/communication/extranets.yml

test/models/communication/extranet_test.rb