changes to manage languages

Gemfile

Gemfile.lock

app/models/communication/extranet.rb

app/models/language.rb

app/services/filters/admin/users.rb

app/views/admin/application/i18n/_widget.html.erb

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

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

app/views/admin/users/_form.html.erb

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

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

db/schema.rb

test/fixtures/communication/extranets.yml

test/fixtures/user/favorites.yml