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Drupal is a free and open source modular content management system written in PHP. Drupal, like many modern CMSs, allows the system administrator to organize the content, customize the presentation, automate administrative tasks, and manage site visitors and contributors. Although there is a sophisticated programming interface, most tasks can be accomplished with little or no programming.

Here is a quick how to for users describing how to modify your interface through the locale module. Click for a full scale version