billing: Modify title.

corporate/views/billing_page.py

@@ -104,6 +104,7 @@ def billing_home(
     context: Dict[str, Any] = {
         "admin_access": user.has_billing_access,
         "has_active_plan": False,
+        "org_name": user.realm.name,
     }
 
     if not user.has_billing_access:

templates/corporate/billing.html

@@ -12,7 +12,7 @@
         <div class="page-content">
             <div class="main">
                 <div class="alert alert-danger" id="error-message-box"></div>
-                <h1>{{ _("Billing") }}</h1>
+                <h1>Zulip Cloud billing for {{ org_name }}</h1>
                 {% if admin_access and has_active_plan %}
                 <ul class="nav nav-tabs" id="billing-tabs">
                     <li class="active"><a data-toggle="tab" href="#overview">Overview</a></li>