Base18 is a Zope product which allows to build multilingual portals. It uses Localizer and extends the Zope CMFDefault product to provide a way to translate documents at a sentence per sentence level.
It implements a new kind of CMF document: Translations. Translations allow to store a .po file which allows to translate a given document. This approach was inspired by the poxml approach used by the KDE project to translate its documentation.
Because it works at the sentence or paragraph level, it is possible to use the fuzzy feature of gettext to find similar translations for a given sentence and accelerate the translation process.
Base18 also includes a translation workflow which allows to keep track of translations and their association to documents in a portal. It was used to translate the Storever and ERP5 sites with KBabel (see screenshot bellow).
Base18 is currently much of a "proof-of-concept" which needs to be extended. Future versions will include greater flexibility and improved user interface.
More information can be found on the Nexedi site:
http://www.nexedi.org/software