Add missing expectations after refreshing the page

This way we know for sure the page has finished refreshing.

Note that, for now, we aren't adding a check after every call to the
`refresh` method because sometimes the page remains identical after
refreshing. Not sure what we should do in these cases.

spec/system/admin/site_customization/information_texts_spec.rb

@@ -75,6 +75,9 @@ describe "Admin custom information texts", :admin do
       expect(page).to have_content "Translation updated successfully"
 
       refresh
+
+      expect(page).not_to have_content "Translation updated successfully"
+
       select "Français", from: "Current language"
 
       expect(page).to have_content "Aide personalise sur les débats"