add temporary error message for ORA panel

lms/templates/open_ended_problems/open_ended_problems.html

@@ -16,6 +16,17 @@
 <section class="container">
     <div class="open-ended-problems" data-ajax_url="${ajax_url}">
         <div class="error-container">${error_text}</div>
+        <br>
+        <div style="color:red;">
+            <b>
+                ${_("We're sorry, some student responses have been temporarily "
+                    "hidden. We appreciate your patience as we work hard "
+                    "to restore their visibility. Rest assured, no student "
+                    "data has been lost.")}
+            </b>
+        </div>
+        <br>
+        <hr>
         <h1>${_("Open Ended Problems")}</h1>
         <h2>${_("Instructions")}</h2>
         <p>${_("Here is a list of open ended problems for this course.")}</p>