As admin, force post to have nsfw/spoiler tag.

Description: As an admin I would like to have the ability to censor the post of a user. 

Use Case: User posts a picture of a game but doesn't realize others have not beaten it. I don't want to remove their post, but simply blur their photo.

Acceptance Criteria: As admin (with correct permissions), I right-click the selected post and mark as nsfw/censor.