stats: Include Zulip and realm name in heading.

analytics/views.py

@@ -39,7 +39,8 @@ from typing import Any, Dict, List, Tuple, Optional, Sequence, Callable, Type, \
 @zulip_login_required
 def stats(request):
     # type: (HttpRequest) -> HttpResponse
-    return render_to_response('analytics/stats.html')
+    return render_to_response('analytics/stats.html',
+                              context=dict(realm_name = request.user.realm.name))
 
 @has_request_variables
 def get_chart_data(request, user_profile, chart_name=REQ(),

templates/analytics/stats.html

@@ -22,7 +22,7 @@
 </div>
 <div class="page-content">
   <div id="id_stats_errors" class="alert alert-error"></div>
-  <h1 class="analytics-page-header">Analytics</h1>
+  <h1 class="analytics-page-header">Zulip Analytics for {{ realm_name }}</h1>
   <div class="center-container">
     <div class="center-block">
       <p class="graph-title" id="messages_timescale_anchor">Messages Sent Over Time</p>