ticket 1705 - internationalize help topics

* Wrap each topic description in _()

* Replace the use of if 'topic' in dir(module) with the more
  Pythonic and efficient getattr(module, 'topic', None)

* Make sure to invoke unicode on the value returned from _()
  otherwise you'll get a GettextFactory instance, not a string

* Clean up trailing whitespace errors

ipalib/plugins/hbacsvcgroup.py

@@ -45,7 +45,7 @@ from ipalib import api, errors
 from ipalib.plugins.baseldap import *
 from ipalib import _, ngettext
 
-topic = ('hbac', 'Host based access control commands')
+topic = ('hbac', _('Host based access control commands'))
 
 class hbacsvcgroup(LDAPObject):
     """