power: Use new setup mechanism

plinth/modules/power/__init__.py

@@ -23,11 +23,20 @@ from django.utils.translation import ugettext_lazy as _
 
 from plinth import cfg
 
+version = 1
+
+is_essential = True
+
 depends = ['system']
 
+title = _('Power')
+
+description = [
+    _('Restart or shut down the system.')
+]
+
 
 def init():
     """Initialize the power module."""
     menu = cfg.main_menu.get('system:index')
-    menu.add_urlname(_('Power'), 'glyphicon-off',
-                     'power:index', 1000)
+    menu.add_urlname(title, 'glyphicon-off', 'power:index', 1000)

plinth/modules/power/templates/power.html

@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,13 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{{ title }}</h2>
-
-  <p>
-    {% blocktrans trimmed %}Restart or shut down the system.{% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <p>
     <a class="btn btn-default btn-md" href="{% url 'power:restart' %}">

plinth/modules/power/views.py

@@ -26,11 +26,14 @@ from django.template.response import TemplateResponse
 from django.utils.translation import ugettext as _
 
 from plinth import actions
+from plinth.modules import power
 
 
 def index(request):
     """Serve power controls page."""
-    return TemplateResponse(request, 'power.html', {'title': _('Power')})
+    return TemplateResponse(request, 'power.html',
+                            {'title': power.title,
+                             'description': power.description})
 
 
 def restart(request):