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_1796477


Bráulio Bhavamitra

@terceiro I would merge this NOW, this clean the big mess in action tracker.

it comes from html_safe and rails4 branch.

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