If a document is not completely translated or its translations became stale the build process needs to adapt. This should be configurable and documented.
- only show //last complete translation// of the documents, risking that foreign users miss documentation updates.
- show //stale// paragraphs together with their untranslated counterpart.
- show untranslated paragraphs //instead// of stale ones.
- a combination of these. :-)
The build process can't (and shouldn't) decide whether a translation is incomplete or stale because PO files have no indication on that. As such, behaviour needs to be the same for both cases.