A neat new Gmail Labs feature can translate email in another language to your native tongue. That’s cool, but when it comes to foreign languages, what Gmail really needs is the ability to search and filter by the language a message is written in.
Let’s face it, if you only speak one language, most of the mail in your non-native tongue is likely spam. Imagine being able to create a filter that deletes, archives, or labels all messages that are -lang:English (not in English), or automatically marks any message that’s lang:Russian as spam. Of course, this gets complicated if a message contains a few languages, but it would be a start to avoiding having to manually process messages that are obviously not meant for you.