Fix Firewalls panel to override the right method

Instead of overriding can_acess(), the panel check should
be overriding allowed() method instead. Overriding can_access()
will disable caching for the method.

Change-Id: Ibee85cdcf505e90d9faeb54dbab7216fc24c1b2c
Closes-Bug: #1403701
Imported Translations from Transifex

For more information about this automatic import see:
https://wiki.openstack.org/wiki/Translations/Infrastructure

Change-Id: Ica75da4538406fcc77971a9c32e79d5fbd2af3ee
Merge "Imported Translations from Transifex"
Merge "Fix Firewalls panel to override the right method"
Merge branch 'master' of https://github.com/openstack/horizon