Seeing the manual that says
Quote:
Adding new dictionaries
The spelling checker comes with builtin dictionaries for the English and Spanish languages. You can install your own dictionaries via Preferences->Editor->Manage spelling dictionaries. The spell checker can use dictionaries from the OpenOffice program (in the .oxt format). You can download these dictionaries from The OpenOffice Extensions repository.
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is the EDITOR manual, it would be apparent that this is referring to the menus found in the EDITOR and NOT in calibre itself.