Missing Key for delete all posts confirmation

On version v1.8.0.beta8 +24, in a production environment, I’m getting a missing key for admin.user.delete_all_posts_confirm_MF.

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@techAPJ can you add to your list?

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I am not sure how this was working before as message format support was not present for client admin locales. PR here:

https://github.com/discourse/discourse/pull/4778

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