add template I forgot

lms/templates/module-error-staff.html

+<section class="outside-app">
+  <h1>There has been an error on the <em>MITx</em> servers</h1>
+  <p>We're sorry, this module is temporarily unavailable. Our staff is working to fix it as soon as possible. Please email us at <a href="mailto:technical@mitx.mit.edu">technical@mitx.mit.edu</a> to report any problems or downtime.</p>
+
+<h1>Staff-only details below:</h1>
+
+<p>Error: ${error}</p>
+
+<p>Raw data: ${data}</p>
+
+</section>