Put this forum in several languages

No may be a bit crude, but that still is the correct answer.
A few reasons to have it in English:

• Pretty common language, best suited for a worldwide userbase (see attachement)
  
• LFS devs created and maintain this place, English is their communication language - read Scawen's posts
  
• Learning English for or through this forum will help you
  
• How would you do a multi language forum? Giggle translate ?
  

Quote from David 09 :

Put this forum in several languages

Learn English.

(It's as blunt as your request and gets the job done even better, as there are years worth of posts to search through and then ignore when you create a new thread on an old topic...)