Allow Django unknown language in LANGUAGES settings

Language preference form expects all languages in LANGUAGES in
openstack_dashboard/settings.py. This leads to an error when
adding a language not listed in django/conf/locale to LANGUAGES list.

This commit allows such language to LANGUAGES in the settings file.

Closes-Bug: #1229026

Change-Id: I37d7f4b089b0299942f25084f741a557467b3be7
Fix a bug firewall rule creation fails with ANY protocol

Change-Id: I9dc92becd748008e3981126d90feaec7b7c8882f
Closes-Bug: #1229543
Update English PO files

This updates the PO files for translation after string changes
introduced in commit 21eaa8fa58d635c62f531c66c6c831fe7fbcdbb6

Closes-Bug: #1229749

Change-Id: I73364670b19db666ca3c08d83128d647f63ea495
Fix editing of nameless images

We can't assume image.name is a valid attribute as Glance
doesn't send it for images that don't have a name.

This is a targeted fix to handle two cases where we access the name.
Where the name is not available, this shows the ID instead.

In the future we may want to look at wrapping images in our own class
so we can clean up data as it is returned from the API.

Change-Id: Ida50ce74efafff287a0189dc90aa529e80bd5961
Closes-bug: 1223921
Fix excessive volume_get requests in snaps table

The volume snapshots table has a column that shows the associated volume
name and links to its volume detail page. This calls volume_get twice
for each snapshot, so loading the Images & Snapshots page takes forever
if you have a decent number of snapshots.

This commit instead gets the volume list at the same time as the
volume snapshot list, and stores the volume as an attribute on
the snapshot so it can be easily retrieved later.

Closes-bug: 1218259
Change-Id: I004e50aae51a6ed7549da41967bc42babfa6cb45
Merge "Fix a bug firewall rule creation fails with ANY protocol"
Merge "Update English PO files"
Merge "Allow Django unknown language in LANGUAGES settings"
Merge "Fix excessive volume_get requests in snaps table"
Merge "Fix editing of nameless images"