Hey Tomas, there is active development in our discourse-translator plugin as Dave has mentioned above.
The ultimate goal for this is to have a Discourse for everyone — where we can converse across all languages. What this means exactly is that we will give Discourse community owners the ability to translate all posts (automatically) to languages of their choice. In addition, community users will be able to set up Discourse such that all content (controls, topics, posts) are displayed in their language.
This is currently an experimental feature, and there are some details on how this all works. I will be announcing this properly on meta soon™ as I fix some of the minor bugs.