noosfero | fix html escape of activity lead (!899)

[Leandro Nunes]

New Merge Request !899

https://gitlab.com/noosfero/noosfero/merge_requests/899

Project:Branches: participa/noosfero:html-safe-activity to noosfero/noosfero:master
Author:    Leandro Nunes
Assignee:  

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