Move disclosure log to common part of form.

It isn't in the list of attributes that is translated, so was causing a
mass assignment error when the code in public_body.translated_versions=
was attempting to assign it. There's a possible underlying inconsistency
here between the treatment of publication_scheme and disclosure_log -
one is translated and one isn't. I've ticketed that separately (#1264)
Move "Act on what you've" learnt to partial

In order to make it easier to override.
Search for bodies using the underscore version of the locale.
Make sure globalize uses the right locale version when updating.
Merge branch 'feature/locale-underscore-fixes' into rails-3-develop
Merge branch 'feature/overridable-act-on' into rails-3-develop
Merge branch 'feature/1263-public-body-translation-fix' into rails-3-develop