Correct a typo

apps/openassessment/xblock/static/html/t-messages.html

 <!-- if the problem is closed and incomplete -->
 <div id="openassessment__message" class="openassessment__message message message--incomplete">
-    <h3 class="message__title">Reseponse Submissions Are Closed</h3>
+    <h3 class="message__title">Response Submissions Are Closed</h3>
     <div class="message__content">
         <p>This assignment’s due date has passed and you can no longer submit a response. Your grade for this assignment is <a data-behavior="ui-scroll" href="#openassessment__grade">Incomplete</a>.</p>
     </div>
@@ -50,6 +50,6 @@
 <div id="openassessment__message" class="openassessment__message message message--complete">
     <h3 class="message__title">You Have Completed This Assignment</h3>
     <div class="message__content">
-        <p>Your grade will be available when your peers have completed their assessments on your response.</p>
+        <p>Your grade will be available when your peers have completed their assessments of your response.</p>
     </div>
 </div>
\ No newline at end of file