add contract preview to the amendment signing form

spec/features/user_managing_location_releases_spec.rb

@@ -251,10 +251,9 @@ feature "User managing location releases" do
       new_window = window_opened_by { click_link sign_amendment_link }
       within_window new_window do
         expect(page).to have_content amendments_heading
-        expect(page).to have_content body_clause_heading
+        expect(page).to have_content signed_contract_preview.upcase
 
-        expect(page).to have_content contract_template.body.to_plain_text
-        expect(page).to have_content contract_template.amendment_clause.to_plain_text
+        expect(page).to have_selector 'embed'
 
         fill_in amendment_signer_name_field, with: 'Big Signer'
         draw_signature file_fixture("signature.png"), amendment_signature_field
@@ -694,8 +693,8 @@ feature "User managing location releases" do
     t 'public.amendments.new.amendment.heading'
   end
 
-  def body_clause_heading
-    t 'public.amendments.new.body_clause.heading'
+  def signed_contract_preview
+    t 'public.amendments.new.signed_contract_preview'
   end
 
   def amendment_signer_name_field