[ADD] website_forum: Adding Social Network Sharing functionality to shar...

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Containing the biggest sql statement ever.

- Task: https://www.odoo.com/web?debug=#id=8601&view_type=form&model=project.task
- Pad: https://pad.odoo.com/p/r.ca4Qi9dcQZSnPQm9
Do not include JS code directly in your HTML template, use a CSS class and jQuery's `click()` to bind a method that will handle the click on this link.