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

[Gabriel Silva]

New Merge Request !1160

https://gitlab.com/noosfero/noosfero/merge_requests/1160

Project:Branches: gabrielssilva/noosfero:content_summary_html_safe to noosfero/noosfero:master
Author:    Gabriel Silva
Assignee:  

### before
![before](/uploads/f0229a0e4274bab28147c3d5674df1a0/before.png)


### after
![after](/uploads/b19a9952048a5367645f2f760921772a/after.png)

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