Google has added experimental support for spellchecking in multiple languages simultaneously in Chrome Canary, the company's version of the Chrome browser designed for developers and early adopters. Here's how you can turn on the feature.
If you happen to type in more than one language, then this Multilingual Spellchecker feature will come in handy. To use it, simply open your Chrome Canary browser and direct it to chrome://flags/#enable-multilingual-spellchecker. You can then go to Chrome Settings and select the language you want the spellchecker to support.
You can see the review notes for this feature over at the Chromum Code Reviews page.