I guess this is a topic that have been discussed and argued about many times. But I always preferred building complete systems from scratch, and never bothered with any framework, cms or the likes.

Anyhow, will be taking on several smaller projects, nearly all multi-lingual, and was wondering if (and which) ther is a framework to not only allow you easily build multi-lingual sites, but also make it easy for site-owners to add and edit languages.