How do I add spellcheck / dictionaries in macos Sierra? Got .aff and .dic files I'm specifically trying to install system-wide support for Bulgarian. Tried looking for library/spelling but seems to be missing in macos Sierra. Got .aff and .dic files but... now what? Thank you.
Put them in Home/Library/Spelling.  To get to Home/Library, you hold down the option key while doing Finder > Go