add all available locales to pages_spec, ensures all custom sites translations are correct, as before it would check only :fr

spec/system/admin/site_customization/pages_spec.rb

@@ -1,6 +1,12 @@
 require "rails_helper"
 
 describe "Admin custom pages", :admin do
+  I18n.available_locales = [:ar, :bg, :bs, :ca, :cs, :da, :de, :el, :en, :es, :"es-PE", :eu, :fa, :fr,
+                                  :gl, :he, :hr, :id, :it, :ka, :nl, :oc, :pl, :"pt-BR",
+                                  :ro, :ru, :sl, :sq, :so, :sr, :sv, :tr, :val, :"zh-CN", :"zh-TW"]
+  SiteCustomization::Page.destroy_all
+  Rails.application.load_seed
+
   context "Index" do
     scenario "lists all created custom pages" do
       custom_page = create(:site_customization_page)
@@ -33,15 +39,15 @@ describe "Admin custom pages", :admin do
                 welcome_not_verified: "welcome.welcome.title",
                 welcome_level_two_verified: "welcome.welcome.title",
                 welcome_level_three_verified: "welcome.welcome.title" }
-      locale = :fr
+      I18n.available_locales.each do |locale|
         I18n.locale = locale
-
         paths.each do |slug, path|
           site = SiteCustomization::Page.find_by(slug: slug).translations.find_by(locale: locale)
           expect(site.title).to eq I18n.t(path)
         end
       end
     end
+  end
 
   context "Create" do
     scenario "Valid custom page" do