mod reports: include reported user and message in forum post.

Also fix it so that reports against dmails include the key in the dmail
link so that mods can view the reported dmail.

app/models/application_record.rb

@@ -424,7 +424,7 @@ class ApplicationRecord < ActiveRecord::Base
   end
 
   concerning :DtextMethods do
-    def dtext_shortlink
+    def dtext_shortlink(**options)
       "#{self.class.name.underscore.tr("_", " ")} ##{id}"
     end
   end

app/models/dmail.rb

@@ -191,4 +191,8 @@ class Dmail < ApplicationRecord
   def reportable_by?(user)
     is_recipient? && !is_automated? && !from.is_moderator?
   end
+
+  def dtext_shortlink(key: false, **options)
+    key ? "dmail ##{id}/#{key}" : "dmail ##{id}"
+  end
 end

app/models/moderation_report.rb

@@ -39,15 +39,16 @@ class ModerationReport < ApplicationRecord
   end
 
   def forum_post_message
-    messages = ["[b]Submitted by:[/b] @#{creator.name}"]
-    messages << "[b]Submitted against:[/b] #{model.dtext_shortlink}"
-    messages << ""
-    messages << "[quote]"
-    messages << "[b]Reason:[/b]"
-    messages << ""
-    messages << reason
-    messages << "[/quote]"
-    messages.join("\n")
+    <<~EOS
+      [b]Report[/b] modreport ##{id}
+      [b]Submitted by[/b] <@#{creator.name}>
+      [b]Submitted against[/b] #{model.dtext_shortlink(key: true)} by <@#{reported_user.name}>
+      [b]Reason[/b] #{reason}
+
+      [quote]
+      #{model.body}
+      [/quote]
+    EOS
   end
 
   def create_forum_post!

app/models/user.rb

@@ -820,7 +820,7 @@ class User < ApplicationRecord
     @presenter ||= UserPresenter.new(self)
   end
 
-  def dtext_shortlink
+  def dtext_shortlink(**options)
     "<@#{name}>"
   end
 end