Modal header should default to page_header

[Rob Cresswell]

Many modals have a modal_header value that is identical to page_header; we could just default to page_header and remove the duplication.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/416552

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/416552
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=83e3ff88ec2f3b776c282bdb73fdf23cb2ab3468
Submitter: Jenkins
Branch: master

commit 83e3ff88ec2f3b776c282bdb73fdf23cb2ab3468
Author: Rob Cresswell <email address hidden>
Date: Wed Jan 4 13:31:36 2017 +0000

    Remove duplicated modal_header statements

    Across the codebase we've been using modal_header values that are
    identical (or very close to) the page_title values. This patch sets the
    modal_header to default to the page_title value, and cleans up a few
    inconsistencies. Also deleted a couple of redundant submit_label values
    that were identical to the default ("Submit").

    Change-Id: I88815c3801c29b3fbc41e0cb426a50653255595f
    Closes-Bug: 1653960

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/horizon 11.0.0.0b3 development milestone.