Adding Arabic dictionary for TSearch2.. to_tsvector('arabic'...) doesn't work.. - Mailing list pgsql-general

I have just made the switch from MySql to PostgreSql to be able to take advantage of TSearch2 and I just arrived to the mailing list :) I am creating a website in two languages (english, arabic) and would like to have dictionaries for both for my search. I noticed that arabic wasn't in as default. How can I add it / make it work ? 

I am currently saving the english and arabic text in the same relation. So I guess I could create two indexes over the two dictionaries or should I split them ? 

/ Moe