Bad news for you, this option have been removed in chrome. Since the update of December 2015 the spell check option from the right-click menu disappeared and so you can not change the language for the spell checker as you normally would.
The good news is that in Chrome 47 was implemented the automatic spell checker in multiple languages! So you can continue to type in different languages, and Chrome will automatically spell check all of your input text without you needing to manually change languages.
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