There are many times when you may want to subscribe to feeds in a non-English language, but may not do so due to lack of translations required to read those feeds.
The reader translation is another 20% project where Google allows its engineers to use 20% of their time to work on projects unrelated to work, that they love.
The 20% projects have definitely seen a lot of new features added to various Google products including Gmail which has had a barrage of new features added over the past couple of months.
To enable automatic translation for any feed, select feed settings and click on Translate into my language
Once you have selected the option for a feed, Google Reader will automatically translate the feed to the language you have selected in the settings. Google Reader supports translation to and from the the languages available for translation in Google Translate.