Theme missed error pages with settings values

In the initial theming pass, we missed two error pages. This commit
replaces edX values with PLATFORM_NAME and TECH_SUPPORT_EMAIL
settings.

lms/templates/courseware/courseware-error.html

 <%inherit file="/main.html" />
 <%namespace name='static' file='../static_content.html'/>
 <%block name="bodyclass">courseware</%block>
-<%block name="title"><title>Courseware – edX</title></%block>
+<%block name="title"><title>Courseware – ${settings.PLATFORM_NAME}</title></%block>
 
 <%block name="headextra">
   <%static:css group='course'/>
@@ -11,7 +11,7 @@
 
 <section class="container">
   <section class="outside-app">
-    <h1>There has been an error on the <span class="edx">edX</span> 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@edx.org">technical@edx.org</a> to report any problems or downtime.</p>
+    <h1>There has been an error on the <span class="edx">${settings.PLATFORM_NAME}</span> servers</h1>
+    <p>We're sorry, this module is temporarily unavailable. Our staff is working to fix it as soon as possible. Please email us at <a href="mailto:${settings.TECH_SUPPORT_EMAIL}">${settings.TECH_SUPPORT_EMAIL}</a> to report any problems or downtime.</p>
   </section>
 </section>

lms/templates/module-error.html

 <section class="outside-app">
-  <h1>There has been an error on the <em>edX</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@edx.org">technical@edx.org</a> to report any problems or downtime.</p>
+  <h1>There has been an error on the <em>${settings.PLATFORM_NAME}</em> servers</h1>
+  <p>We're sorry, this module is temporarily unavailable. Our staff is working to fix it as soon as possible. Please email us at <a href="mailto:${settings.TECH_SUPPORT_EMAIL}">${settings.TECH_SUPPORT_EMAIL}</a> to report any problems or downtime.</p>
 
 % if staff_access:
 <h1>Details</h1>