Disallow publishing content until it is approved by a specified number of people.

evidentlycube

This plugin allows selecting content types (post, page, custom) that are subject to quality control, where specified 
editors have to approve them before they cna be published.
Features: 
1. Separate configuration for each content type. 
2. Define list of users who can approve content. 
3. Define the minimum number of approvals requires for the content to be publishable.

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