List consular services by country.

Provides an alphabetical index of countries and their british consular
services including alternatives where no services are offered in that
country.
Fix consular service offices with the wrong office type
Add Organisation#has_child_organisation? method.
Call it an Embassy

The thing we are representing is a view across several models
incorporating a WorldLocation, WorldwideOrganisations, their
WorldwideOffices and the address information. For brevity and convention
I've called this an Embassy.
Tidy up layout and styles
Enforce permission for organisation editing.

Editing is only allowed for GDS Admins, or users in the organisation being
edited or its parent.
Fix feature tests after org editing change.
Adds Regulation Publication sub-type
Regenerate translation keys
Actions PR comments

* Moves Notice and Decision pub sub-types into "Less common" group
* Removes unneeded additional type verification from publications controller test
* Moves regulation locale key into a more appropriate alphabetical ordering
Merge pull request #1714 from alphagov/embassies_index

This is very low risk as it's not currently linked to anywhere on Whitehall or mainstream content.
Merge pull request #1715 from alphagov/limit_organisation_editing

Limit organisation editing permissions
Merge pull request #1721 from alphagov/pub-sub-type-regulations-for-maa

Add publication sub-type of `Regulation` for the Military Aviation Authority (MAA)