Cannot add word to the custom dictionary

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As you see in the GIF it does not respond to any clicks. Nothing happens.

FIY: You gotta click on the play button to play the GIF.

Is this a community plugin? If so, it’s best to state that up front and link to it.

Anything on their GitHub page?

Oh I didn’t realize it was. Sorry. It’s a plugin called Various Complements.

Why can’t I edit or delete a post? WTF…