How to setup spell check in TortoiseHg 1.1.7?

http://tortoisehg.bitbucket.io/manual/开发者_如何学Go0.9/settings.html says I can setup spell check language. But I can't find that option in my Global Settings. Am I missing any extensions?

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The manual also says:

Spell Check Language:
Default language for spell check. System language is used if not specified. Examples: en, en_GB, en_US. Spell checking requires gtkspell, which is only available on Gnome PCs.

Are you using Gnome? Have you installed "gtkspell"?