Create language in pages feature spec

The redirecting is tested at the controller level.

spec/features/page_feature_spec.rb

@@ -3,7 +3,7 @@
 require 'rails_helper'
 
 RSpec.describe 'Show page feature:', type: :system do
-  let!(:default_language) { Alchemy::Language.default }
+  let!(:default_language) { create(:alchemy_language) }
 
   let!(:default_language_root) do
     create(:alchemy_page, :language_root, language: default_language, name: 'Home')