Unicode strings for server error page

lms/templates/static_templates/server-error.html

@@ -2,6 +2,12 @@
 <%inherit file="../main.html" />
 
 <section class="outside-app">
-  <h1>${_("There has been a 500 error on the <em>{platform_name}</em> servers").format(platform_name=settings.PLATFORM_NAME)}</h1>
-  <p>${_('Please wait a few seconds and then reload the page. If the problem persists, please email us at <a href="{email}">{email}</a>.').format(email=settings.TECH_SUPPORT_EMAIL)}</p>
+  <h1>${_(u"There has been a 500 error on the <em>{platform_name}</em> servers").format(
+    platform_name=settings.PLATFORM_NAME
+  )}</h1>
+  <p>${_(u'Please wait a few seconds and then reload the page. If the problem persists, please email us at {email}.').format(
+        email=u'<a href="{email}">{email}</a>'.format(
+            email=settings.TECH_SUPPORT_EMAIL
+        )
+  )}</p>
 </section>