Sorry Juan, Never tested the forum with translatable components. Ive never used translatable myself so if you could list the issues with screenshots on open.silverstripe.org we can see those get fixed.
draft - it searchs author names, title of the post as well as the content of the post. It compares the query to the DB using a match query. See http://dev.mysql.com/doc/refman/5.1/en/fulltext-search.html. You can see how the search function works in code/forum/ForumHolder.php in the SearchResults() function
Thx, i have found the search function.. Haven't look detail about the code, but seems the logic isn't relevant enough for the search functionality.
For example, try in in this ss forum, search 'aa', and it will return new forums title at the top search result, but if i search 'new forums', the new forums thread is not even in the first page of the search result.. I think it's probably because the search function logic doesn't give like a priority for title.
And other weird thing, you can try it to search it in this ss forum, if you search 'a', it will return html tag in it, why is that happening? Since it run from the same logic query..