Want to use Gmail in a different language, or type with a Dvorak keyboard? Google has added 100 new keyboard input systems to Gmail, meaning you can now type in 75 different languages.
To enable the new option, click on the settings Gear icon, choose Settings, choose Languages and make sure 'Select input tools' is ticked. You can then set up a menu of your preferred language options, and they'll be accessible from a keyboard drop-down next to the gear icon in the top right corner.
Communicate more easily across languages in Gmail [Official Gmail Blog]