Use container-box/box-header.@title instead of embedded label

Author: jenshp

screen/PopCommerceRoot/Customer/Profile.xml

@@ -78,7 +78,7 @@ along with this software (see the LICENSE.md file). If not, see
                     </actions>
                     <widgets>
                         <container-box>
-                            <box-header><label text="Billing Information" type="h5"/></box-header>
+                            <box-header title="Billing Information"/>
                             <box-toolbar>
                                 <dynamic-dialog id="CreateCreditCardDialog" button-text="Create Credit Card"
                                         transition="updatePaymentMethodInfo" width="800"
@@ -112,7 +112,7 @@ along with this software (see the LICENSE.md file). If not, see
                     </actions>
                     <widgets>
                         <container-box>
-                            <box-header><label text="Shipping Information" type="h5"/></box-header>
+                            <box-header title="Shipping Information"/>
                             <box-toolbar>
                                 <dynamic-dialog id="UpdatePostalInfo" button-text="Add Shipping Info"
                                         transition="updateContactInfo" width="800"

screen/PopCommerceRoot/Order/Checkout.xml

@@ -57,7 +57,7 @@ along with this software (see the LICENSE.md file). If not, see
     </actions>
     <widgets>
         <container-box>
-            <box-header><label text="Choose a Credit Card" type="h5"/></box-header>
+            <box-header title="Choose a Credit Card"/>
             <box-toolbar>
                 <dynamic-dialog id="CreateCreditCardDialog" button-text="Add Credit Card"
                         transition="updatePaymentMethodInfo" width="800"
@@ -85,7 +85,7 @@ along with this software (see the LICENSE.md file). If not, see
         </container-box>
 
         <container-box>
-            <box-header><label text="Choose a Shipping Address" type="h5"/></box-header>
+            <box-header title="Choose a Shipping Address"/>
             <box-toolbar>
                 <dynamic-dialog id="UpdatePostalInfo" button-text="Add Shipping Address"
                         transition="updateContactInfo" width="800"

screen/PopCommerceRoot/Product/Detail.xml

@@ -115,7 +115,7 @@ along with this software (see the LICENSE.md file). If not, see
 
         <container-row><row-col lg="6" md="6">
             <container-box>
-                <box-header><label text="Features" type="h5"/></box-header>
+                <box-header title="Features"/>
                 <box-body>
                     <form-list name="FeaturesForm" list="pfaaList" skip-form="true" skip-header="true">
                         <field name="productFeatureTypeEnumId"><default-field title="Type">
@@ -126,7 +126,7 @@ along with this software (see the LICENSE.md file). If not, see
             </container-box>
         </row-col><row-col lg="6" md="6">
             <container-box>
-                <box-header><label text="Dimensions" type="h5"/></box-header>
+                <box-header title="Dimensions"/>
                 <box-body>
                     <form-list name="DimensionsForm" list="dimensionList" skip-form="true" skip-header="true">
                         <field name="description"><default-field title="Type"><display/></default-field></field>