Amélioration des écrans de connexion, notamment le code MFA (#2156)

Gemfile.lock

README.md

app/assets/stylesheets/commons/_devise.sass

app/assets/stylesheets/commons/_forms.sass

app/views/application/_footer.html.erb

app/views/application/_notice.html.erb

app/views/devise/confirmations/new.html.erb

app/views/devise/passwords/edit.html.erb

app/views/devise/passwords/new.html.erb

app/views/devise/registrations/edit.html.erb

app/views/devise/registrations/new.html.erb

app/views/devise/sessions/new.html.erb

...factor_authentication/max_login_attempts_reached.html.erb

app/views/devise/two_factor_authentication/show.html.erb

app/views/devise/unlocks/new.html.erb

app/views/extranet/layouts/devise.html.erb

app/views/layouts/devise.html.erb

config/locales/devise.en.yml

config/locales/devise.fr.yml

config/locales/en.yml