noosfero | Add option to clone an article (#579)

[Rodrigo Souto]

New comment for Merge Request 579

https://gitlab.com/noosfero/noosfero/merge_requests/579#note_1253250


Rodrigo Souto

I would prefer if this method is written by the proper helper of each article (like it's done with the other methods above using article_helper). And instead of `class_to_s` name it `translated_class_name`.

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