delete a space and non latin characters in space names

Hi there, I'm quite new to XWiki and I faced two major and one minor problem around spaces. 1. [major] how can I delete a space (and all its child pages) 2. [major] can I use non latin characters is a space name (I have an UTF-8 configured Postgres database backend) 3. [minor] is it possible to rename a space? Thanks for your answers! Cheers, P