I created a new addon collective.ttwpo. It enables Site-Managers to manage translations of the UI (PO-files) TTW.
- manage i18n-domains and languages in Plone
- upload GNU #Gettext *.po files (and manage different version, so roll back is possible).
- connect webservices and fetch po-files from it. For now only Zanata is supported, but the system itself is pluggable.