Impacted versions:
Latest Odoo Forum

Steps to reproduce:
Get a nofitication from the Odoo forum (by subscription or by a comment to your posting)

Current behavior:
The notification email contain the subject: "Re: False" and contains no link to the forum post.
Expected behavior:
The notification email contains the title of the forum post and a link to the forum post.
Video/Screenshot link (optional):

![selection_195](https://cloud.githubusercontent.com/assets/1814941/15383579/60b554b0-1d94-11e6-8b1b-875a11e3d82b.png)

addons/website_forum/controllers/main.py
if request.env.uid != request.website.user_id.id:
            request.env.user.send_forum_validation_email(forum_id=forum_id)
        request.session['validation_email_sent'] = True
        return True
    @http.route('/forum/validate_email', type='http', auth='public', website=True)
    def validate_email(self, token, id, email, forum_id=None, **kwargs):
        if forum_id:
            try:
                forum_id = int(forum_id)
            except ValueError:
                forum_id = None
        done = request.env['res.users'].sudo().browse(int(id)).process_forum_validation_token(token, email, forum_id=forum_id)[0]
        if done:
            request.session['validation_email_done'] = True
        if forum_id:
            return request.redirect("/forum/%s" % int(forum_id))
        return request.redirect('/forum')
    @http.route('/forum/validate_email/close', type='json', auth='public', website=True)
    def validate_email_done(self):