didn't determine russian language automaticly in text "семинар по Дзёдо"

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Try to translate text by this function:
$.translate( 'семинар дзёдо', 'en',  function(translation){
            alert(translation); 
});

but this version work fine:
$.translate( 'семинар дзёдо', 'ru', 'en',  function(translation){
            alert(translation); 
});

What is the expected output? What do you see instead?
expected output is "Seminar Jodo", but I didn't see anything

What version of the product are you using? On what operating system?
version 1.4.6, Windows 7, Firefox 3.6.8

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 11 Aug 2010 at 10:42