Plesk Add-ons: Language Packs   
by SWsoft   

English is the default language in Plesk. Add Language packs to your Plesk 7 Reloaded for Linux or Plesk 6.5 for Windows License which will allow you and your customers to view and change the language of the Plesk interface. We are currently working on more than 15 different languages for you to view Plesk in.