noosfero | Update addthis (#388)

[Bráulio Bhavamitra]

New comment for Merge Request 388

https://gitlab.com/noosfero/noosfero/merge_requests/388#note_1536121


Bráulio Bhavamitra

a side effect of this is that noosfero's sites need to use a new addthis' key.

if there is no problem, I'll merge this for 1.3.

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