Allow to create some translations on access and security page

[Ambroise CHRISTEA]

Some translations aren't correctly done on access and security page because of this bug:
https://bugs.launchpad.net/horizon/+bug/1307476

This patch would be useful to allow some translations to be made:
https://review.openstack.org/#/c/91338/

For example, translate "Delete key pair" is not possible in transifex. You can find "Delete" and "Key Pair", but in some other languages, directly translate "Delete key pair" would be needed.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/119748

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/119748
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=209d83bc02da259067306858b41a3efa00efdd2a
Submitter: Jenkins
Branch: master

commit 209d83bc02da259067306858b41a3efa00efdd2a
Author: Ambroise Christea <email address hidden>
Date: Mon Sep 8 14:19:07 2014 +0200

    Allow some translations to be made.

    Transform some action_present and action_past variables from attributes to
    methods with the solution proposed in this patch:
    https://review.openstack.org/#/c/91338/
    Also fix a bug in the solution above where the __init__ function in the
    deleteAction class overwrite the action_present and action_past methods.
    Closes-Bug: 1366731

    Change-Id: I9595f9d5a5a3f1ef4d528ddb3e08737a43471402