MAGETWO-58946: [Backport] Custom address attribute not appearing on Checkout summary

Author: RomaKis

app/code/Magento/Checkout/view/frontend/web/template/billing-address/details.html

@@ -10,6 +10,13 @@
     <!-- ko text: currentBillingAddress().city --><!-- /ko -->, <!-- ko text: currentBillingAddress().region --><!-- /ko --> <!-- ko text: currentBillingAddress().postcode --><!-- /ko --><br/>
     <!-- ko text: getCountryName(currentBillingAddress().countryId) --><!-- /ko --><br/>
     <!-- ko text: currentBillingAddress().telephone --><!-- /ko --><br/>
+
+    <!-- ko foreach: { data: currentBillingAddress().customAttributes, as: 'element' } -->
+        <!-- ko foreach: { data: Object.keys(element), as: 'attribute' } -->
+            <!-- ko text: element[attribute].value --><!-- /ko -->
+        <!-- /ko -->
+    <!-- /ko -->
+
     <button type="button"
             class="action action-edit-address"
             data-bind="visible: !isAddressSameAsShipping(), click: editAddress">

app/code/Magento/Checkout/view/frontend/web/template/shipping-address/address-renderer/default.html

@@ -10,6 +10,13 @@
     <!-- ko text: address().city --><!-- /ko -->, <!-- ko text: address().region --><!-- /ko --> <!-- ko text: address().postcode --><!-- /ko --><br/>
     <!-- ko text: getCountryName(address().countryId) --><!-- /ko --><br/>
     <!-- ko text: address().telephone --><!-- /ko --><br/>
+
+    <!-- ko foreach: { data: address().customAttributes, as: 'element' } -->
+        <!-- ko foreach: { data: Object.keys(element), as: 'attribute' } -->
+            <!-- ko text: element[attribute].value --><!-- /ko -->
+        <!-- /ko -->
+    <!-- /ko -->
+
     <!-- ko if: (address().isEditable()) -->
     <button type="button"
             class="action edit-address-link"

app/code/Magento/Checkout/view/frontend/web/template/shipping-information/address-renderer/default.html

@@ -10,4 +10,10 @@
     <!-- ko text: address().city --><!-- /ko -->, <!-- ko text: address().region --><!-- /ko --> <!-- ko text: address().postcode --><!-- /ko --><br/>
     <!-- ko text: getCountryName(address().countryId) --><!-- /ko --><br/>
     <!-- ko text: address().telephone --><!-- /ko --><br/>
+
+    <!-- ko foreach: { data: address().customAttributes, as: 'element' } -->
+        <!-- ko foreach: { data: Object.keys(element), as: 'attribute' } -->
+            <!-- ko text: element[attribute].value --><!-- /ko -->
+        <!-- /ko -->
+    <!-- /ko -->
 <!-- /ko -->