noosfero | Fixes escaped HTML in new article mail notification (!1160)

[Rodrigo Souto]

Merge Request !1160 was merged
Merge Request url: https://gitlab.com/noosfero/noosfero/merge_requests/1160
Project:Branches: gabrielssilva/noosfero:content_summary_html_safe to noosfero/noosfero:master
Author: Gabriel Silva
Assignee: Rodrigo Souto
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