Fix #4404: Wrong error message when disapproving an already active post.

app/models/post_disapproval.rb

@@ -4,7 +4,7 @@ class PostDisapproval < ApplicationRecord
 
   belongs_to :post
   belongs_to :user
-  validates_uniqueness_of :post_id, :scope => [:user_id], :message => "have already hidden this post"
+  validates :user, uniqueness: { scope: :post, message: "have already hidden this post" }
   validates_inclusion_of :reason, in: REASONS
   validate :validate_disapproval
 

config/locales/en.yml

@@ -55,13 +55,9 @@ en:
         creator: "You"
         creator_id: "You"
       post_disapproval:
-        post: "You"
-        post_id: "You"
-      comment:
-        post: "You"
-        post_id: "You"
+        user: "You"
+        user_id: "You"
       comment_vote:
-        comment: "You"
         user_id: "You"
       upload:
         uploader: "You"