Ability to localize brand name in templates

- Take the value from the configuration and run it throught the Django
  translate method and make it available in Context.

- Use a no-op translate method to translate the text 'FreedomBox'.

plinth/context_processors.py

@@ -19,6 +19,7 @@
 Django context processors to provide common data to templates.
 """
 
+from django.utils.translation import ugettext as _, ugettext_noop
 import re
 
 from plinth import cfg
@@ -30,10 +31,15 @@ def common(request):
     Any resources referenced in the return value are expected to have been
     initialized or configured externally beforehand.
     """
+    # Allow a value in configuration file to be translated.  Allow
+    # the brand name 'FreedomBox' itself to be translated.
+    ugettext_noop('FreedomBox')
+
     slash_indices = [match.start() for match in re.finditer('/', request.path)]
     active_menu_urls = [request.path[:index + 1] for index in slash_indices]
     return {
         'cfg': cfg,
         'submenu': cfg.main_menu.active_item(request),
-        'active_menu_urls': active_menu_urls
+        'active_menu_urls': active_menu_urls,
+        'box_name': _(cfg.box_name)
     }

plinth/tests/test_context_processors.py

@@ -42,6 +42,8 @@ class ContextProcessorsTestCase(TestCase):
         self.assertIsNotNone(config)
         self.assertEqual('FreedomBox', config.box_name)
 
+        self.assertEqual('FreedomBox', response['box_name'])
+
         submenu = response['submenu']
         self.assertIsNone(submenu)