"translate" in hz-page-header's header attribute does not work

[Shu Muto]

hz-page-header's header attribute became to need to use Angular {$ $} markup.
Same as https://review.openstack.org/223793/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/245616

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/245616
Committed: https://git.openstack.org/cgit/openstack/magnum-ui/commit/?id=448e2644b00fa883f1db9f9eaa9e85f76cf11b42
Submitter: Jenkins
Branch: master

commit 448e2644b00fa883f1db9f9eaa9e85f76cf11b42
Author: shu-mutou <email address hidden>
Date: Mon Nov 16 11:19:39 2015 +0900

    Add {$$} markup into hz-page-header's header attribute.

    This patch adds {$$} markup into hz-page-header's header
    attribute text for translate procedure.

    Change-Id: I5b211d0cb20bba644df3d306fe3ddffaf188424a
    Closes-Bug: #1516475