Add USD to content gating upsell

openedx/features/content_type_gating/templates/content_type_gating/access_denied_message.html

@@ -12,7 +12,7 @@
         {% if not mobile_app and ecommerce_checkout_link %}
         <span class="certDIV_1" style="">
             <a href="{{ecommerce_checkout_link}}" class="certA_2">
-                {% trans "Upgrade to unlock" %}  (${{min_price}})
+                {% trans "Upgrade to unlock" %}  (${{min_price}} USD)
             </a>
         </span>
         {% endif %}