hello,

Please make a very long post on the foreign language and check that it still not work (translation).

url from your post is not working now, so I can check it now again.
Google may not always detected the language for the very short message (maybe misspelling) so you need to check that your message is between [B][lang=[/B] tags. (this tags are adding in newpost_process hook)

so, try to test it for long message in foreign language.