This week we covered the Google one language per page rule and today I spotted a thread specific to how this works with Google News.
A Google News Help thread has Googler Inbal saying you should submit a News Sitemap file for each language. Inbal from Google said:
It is also important to set the language in the News Sitemap file using the n:language tag.
For more on News Sitemap files see here.
Forum discussion at Google News Help.