cleanup; remove language detection duplication
fix wrong slug inuse detection; proper content language detection based on content language
use content language, not browser/translation language when changing slugs
store admin language in session
tests fixed; provide edit option if translation not found
'update' is correct status
provide correct active selection
allow explicit setting of language
get correct (already accessed) content instance
fix home breadcrumb if not translated
i18n support for topnav
make request optional
test and fix for CannotRenameRoot issue when translating root content