Multilanguage

Hello,

I want to create a multi-language wordpress site with forums, but I don’t know which free plugins I have to use to achieve the following simple functionality:

Imagine I create a new category “Science”. I want wordpress to let me define the name for other languages, like in Spanish “Ciencia”, so when a user enters to my website, depending on the browser’s language preference, the appropiate name is displayed.

Also, I want every page I create with a category/subcategory to a forum system, so when the user clicks on a link displayed in every post (page), the browser will redirect to its post in the forum system. So the behaviour in the forum will act like in the category page, showing the correct name (linking categories in pages and forums)

I’ve tried with bbpress plugin and xili-language plugin but I’m not able to implement these features.

Any ideas ?

Thanks in advance,