Suggestions for master.

README.md

@@ -2,6 +2,6 @@ edx-proctoring [![Build Status](https://travis-ci.org/edx/edx-proctoring.svg?bra
 
 ========================
 
-This is the Exam Proctoring subsytsem for the Open edX platform.
+This is the Exam Proctoring subsystem for the Open edX platform.
 
 This is a work in progress at this point in time.

edx_proctoring/callbacks.py

@@ -25,7 +25,7 @@ def start_exam_callback(request, attempt_code):  # pylint: disable=unused-argume
     attempt = get_exam_attempt_by_code(attempt_code)
     if not attempt:
         return HttpResponse(
-            content='That exam code is not valid',
+            content='You have entered an exam code that is not valid.',
             status=404
         )
 

edx_proctoring/templates/proctoring/seq_timed_exam_expired.html

@@ -7,15 +7,17 @@
   </h3>
   <p>
     {% blocktrans %}
-      Since you did not submit your exam before the time allotted expired, your work cannot be
-      considered as an exam that is eligible for credit. Any work you've completed may still be counted for
-      partial credit towards your grade.
+      You are not eligible to receive credit for this exam because you did not submit
+      your exam responses before time expired. Other work that you have completed in this
+      course contributes to your final grade. See the <a href="{{progress_page_url}}">Progress page</a>
+      for your current grade in the course.
     {% endblocktrans %}
   </p>
   <div class="proctored-exam-message">
     <p>
       {% blocktrans %}
-        Please see <a href="{{progress_page_url}}">your progress in this course</a> for your general course credit worthiness.
+        Other work that you have completed in this course contributes to your final grade.
+        See the <a href="{{progress_page_url}}">Progress page</a> for your current grade in the course.
       {% endblocktrans %}
     </p>
   </div>