Wales: Translate follow_us on orgs

NB: I'm not very comfortable with the way we have structured these
translation keys by model/page rather than the actual translation. We
have alot of duplication and this could have been avoided, but
refactoring this now would take much longer than we have allowed for
the story.
See all our links translated

Need to fill out docment.type.two keys

aliasing the world location helper, need to refactor all translation
keys so that they are not just scoped to page, but the what they
actually translate.
Translate documents heading

Copying welsh translation elsewhere
Translate our consultations
Change count on the t_world_location_see_all_our

Picking 100 as it is enough to trigger the :other form of a translation
which we have, the other forms :two etc are missing.
Don't duplicate helpers unnecessarily
Remove unused keys
Move see_all out of world_location namespace
Merge pull request #799 from alphagov/51800603-wales-translations

Translated Wales Office org page still partially in English

https://www.pivotaltracker.com/story/show/51800603