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Automatic Dictionary 1.8.1 No Restart
Extension that remembers the language of the spellchecker used when composing and switches to it every time you write to that person.
About this Add-on
To save the language for the current recipients, change the language by clicking on the "Spellchecker" language selector button, as shown in the screenshot.
To submit bugs go to http://github.com/beltrachi/automatic_dictionary/issues