Modal subTitle fix

Author: textarea

app/code/Magento/Ui/view/base/web/templates/modal/modal-popup.html

@@ -27,7 +27,7 @@ <h1 id="modal-title-<%- data.id %>" class="modal-title"
 
                 <% if(data.subTitle){ %>
                 <span class="modal-subtitle"
-                      data-role="subtitle">
+                      data-role="subTitle">
                     <%= data.subTitle %>
                 </span>
                 <% } %>