Change templates to use site aware email

Template were using global TECH_SUPPORT_EMAIL for error pages. This
changes them to use the site email if there is one.

lms/templates/courseware/courseware-error.html

@@ -3,6 +3,10 @@
 <%namespace name='static' file='../static_content.html'/>
 <%block name="bodyclass">courseware</%block>
 <%block name="pagetitle">${_("Courseware")}</%block>
+<%!
+from django.utils.translation import ugettext as _
+from openedx.core.djangolib.markup import HTML, Text
+%>
 
 <%block name="headextra">
 <%static:css group='style-course-vendor'/>
@@ -15,13 +19,13 @@
   <section class="outside-app">
     <h1>
       ${_('There has been an error on the {platform_name} servers').format(
-          platform_name=u'<span class="edx">{}</span>'.format(settings.PLATFORM_NAME)
+          platform_name=u'<span class="edx">{}</span>'.format(static.get_platform_name())
       )}
     </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 {tech_support_email} to report any problems or downtime.").format(
-      tech_support_email=u'<a href=\"mailto:{0}\">{0}</a>'.format(settings.TECH_SUPPORT_EMAIL)
+      tech_support_email=u'<a href=\"mailto:{0}\">{0}</a>'.format(static.get_tech_support_email_address())
       )}
     </p>
   </section>