Tweak text on 500 error page

lms/templates/static_templates/server-error.html

@@ -2,5 +2,5 @@
 
 <section class="outside-app">
   <h1>There has been a 500 error on the <em>edX</em> servers</h1>
-  <p>Our staff is currently working to get the site back up as soon as possible. Please email us at <a href="mailto:technical@edx.org">technical@edx.org</a> to report any problems or downtime.</p>
+  <p>Please wait a few seconds and then reload the page. If the problem persists, please email us at <a href="mailto:technical@edx.org">technical@edx.org</a>.</p>
 </section>