One powerful feature of a website content management system is its core feature to publish websites along multiple domains, each with different front-ends. And each front-end may have multiple languages for different cultures.
The best CMS allows creation of all different front-ends from a single administration system. A system is required that allows different departments to work on different websites, reusing existing content. A central media and content store becomes an important feature!
Online cultures represent the combination of a nationality with a language. Belgium, for instance, speaks French and Dutch. These are two different web cultures (be_FR and be_NL).