Which language?
http://en.wikipedia.org/wiki/Languages_of_Iran
Once you decide, try this:
http://babelfish.altavista.com/
what is "welcome to iran" in iranian language???
3 answers
english to persian language (farsi)
http://www.google.com/search?q=english+farsi+translate&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA