Gmail Hack Post: Search by Language

I found this on a blog on zdnet and well, I'll save the surprise for the end. Apparently Gmail allows to search by language. Yes. Here's the trick how. Search the following in the search bar-
“language:”.e.g. If you want to search for German, you can type in "language:german" minus the quotes.

Now for the surprise! English isn't supported yet by Gmail. ROTFL.
This simple search in Gmail shows you messages it believes is written in German or Spanish whatever.
Original article linked here.