Updated UK subdivisions list

 These choices will not please everyone, but I once spent a long time
 weighing all the options, and these seemed to please the majority:

- Metropolitan and non-metropolitan counties of England (not the
  ceremonial counties)
- Principal areas of Wales (not the preserved or historic counties)
- Counties of Northern Ireland (not the more recent, but less
  well-known, districts of Northern Ireland)
- Council areas of Scotland

The only change I've made from the linked sources was to rename
"Greater London" to "London".

This Follows on from discussions in
https://github.com/django/django-localflavor/pull/43
Removed welsh translations

These will be updated via Transifex
Merge pull request #126 from jturnbull/master

Updated UK subdivisions list
Added docs for changes to GB region lists.

Refs #43.
Add locale option to translations task.
Updated base translation.
Allow the new 'Y' prefix for Spanish NIE numbers. Fixes #127.
Updated Argentina's ARCUITField to support legal types (24, 33) which are used in some special cases.

See Wikipedia for more details (spanish): http://es.wikipedia.org/wiki/Clave_%C3%9Anica_de_Identificaci%C3%B3n_Tributaria

Also added a test case for legal type 23.
SIRET : cleaning dashes and spaces added in prepare_value

Signed-off-by: CapsLock <faimaison@legeox.net>