FIX: Add test to confirm updating category works.

Also replaces a missing translation key that 99.9% of users would never
see.

config/locales/server.en.yml

@@ -4452,6 +4452,8 @@ en:
         title: "Delete Spammer"
         description: "Remove the user and all their posts and topics."
         confirm: "Are you sure you want to delete all that user's posts, topics, and block their IP and email addresses?"
+      delete_single:
+        title: "Delete"
       delete:
         title: "Delete..."
       delete_and_ignore:

lib/reviewable/actions.rb

@@ -15,6 +15,7 @@ class Reviewable < ActiveRecord::Base
       {
         approve: Action.new(:approve, 'thumbs-up', 'reviewables.actions.approve.title'),
         reject: Action.new(:reject, 'thumbs-down', 'reviewables.actions.reject.title'),
+        delete: Action.new(:delete, 'trash-alt', 'reviewables.actions.delete_single.title')
       }
     end
 

spec/models/reviewable_spec.rb

@@ -55,6 +55,17 @@ RSpec.describe Reviewable, type: :model do
       expect(reviewable.category).to eq(post.topic.category)
     end
 
+    it "will update the category if the topic category changes" do
+      post = Fabricate(:post)
+      moderator = Fabricate(:moderator)
+      reviewable = PostActionCreator.spam(moderator, post).reviewable
+      expect(reviewable.category).to eq(post.topic.category)
+      new_cat = Fabricate(:category)
+      PostRevisor.new(post).revise!(moderator, category_id: new_cat.id)
+      expect(post.topic.reload.category).to eq(new_cat)
+      expect(reviewable.reload.category).to eq(new_cat)
+    end
+
     it "can create multiple objects with a NULL target" do
       r0 = ReviewableQueuedPost.needs_review!(created_by: admin, payload: { raw: 'hello world I am a post' })
       expect(r0).to be_present