[openstreetmap/openstreetmap-website] Add In-Reply-To, References headers to email (#2462)

[Tom Hughes]

tomhughes commented on this pull request.



>        @author = @from_user
 
       attach_user_avatar(comment.user)
 
+      headers["In-Reply-To"] = @ref
+      headers["References"]  = @ref

I think we could reduce the amount of duplication here by having a `set_references` helper function and then just doing `set_references("diary", comment.diary_entry)` etc in each of the three methods?

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