I can't get Turkish => English translation working. I had a similiar problem last night with English => Turkish, but for the most part the translation worked correctly. Sometimes it copies the untranslated text into the translation box.
I also had difficulties resetting the translation. It usually restores the incorrect translation, instead of clearing the translation entirely and allowing me to reload. When I was able to do this for Turkish => English, it worked correctly, but I am not sure how I did it, and I have been unable to duplicate it.
Echoing the comments of other users, it would be nice to have features added like update to Sandbox.