base: update log in pages

* Only ORCID option is available for users.

* NOTE To login with internal account set DEBUG=True or
  /youraccount/login?admin=1

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
base: static page fixes

* Replaces nonexistent ORIG_CFG_SITE_NAME_INTL by
  CFG_SITE_NAME_INTL.

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>