noosfero | html_safe: fix action tracker description mess (#647)

[Bráulio Bhavamitra]

New comment for Merge Request 647

https://gitlab.com/noosfero/noosfero/merge_requests/647#note_1796476


Bráulio Bhavamitra

https://travis-ci.org/coletivoEITA/noosfero-ecosol/builds/73991457

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