Include organization's language along w/document

When the viewer loads the document's JSON representation, it also needs
to know the preferred language for the organization so it can render with
it if available.
Merge branch 'translation' of https://github.com/documentcloud/documentcloud into upstream_translation
Remove vestigial remnants of Organization dialog

It would listen for language change and update the DOM in response.
No longer needed with new Administrator panel layout so have removed it.
Clear Doc cache when Organization language changes
Rename organization_language -> display_language

This better conveys the intent of the setting.
Use _.map vs built-in JS method

Good thing we tested in IE :)
New build of i18n language packs
New build of viewer