Create titles without concatenation

Several panels use the template filter "add" to concatenate data
and translatable text, for example
title=_("Volume Details: ")|add:volume.name|default:_("Volume Details:")

These need to be updated to use string formatting.  This is needed
because it's not clear when looking at the translations if any text
follows the translatable segment.  Dict based substitution has been
used to further clarify the messages for translators.

Change-Id: I54d07233d2003904468ef317c352126eb6bf5f70
Closes-bug: #1394573
POST instantiation for Django-Angular

We currently need to include a CSRF token in our form if we want to POST
to a Django view.  This is cumbersome and should really be a global setting.

Change-Id: I607a0e428833e7478b073eec4d9ef9e1e856ae12
Closes-Bug: #1395270
Merge "Create titles without concatenation"
Merge "POST instantiation for Django-Angular"
Refactor horizon/common/_modal_form.html template

Template _modal_form.html has an identical header with
_modal.html - thus it makes sense to inherit _modal_form.html
from _modal.html to reduce duplication.

Partially Implements: blueprint form-template-to-view
Change-Id: Idf0c9b14712bc1c433cb6a5aef602d1820af915c
Merge "Refactor horizon/common/_modal_form.html template"
Merge branch 'master' of https://github.com/openstack/horizon