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 'post_name' in kwargs and not kwargs.get('post_name').strip():
            return request.website.render('website.http_error', {'status_code': _('Bad Request'), 'status_message': _('Title should not be empty.')})
        post_tags = forum._tag_to_write_vals(kwargs.get('post_tags', ''))
        vals = {
            'tag_ids': post_tags,
            'name': kwargs.get('post_name'),
            'content': kwargs.get('content'),
            'content_link': kwargs.get('content_link'),
        }
        post.write(vals)
        question = post.parent_id if post.parent_id else post
        return werkzeug.utils.redirect("/forum/%s/question/%s" % (slug(forum), slug(question)))
    
    
    @http.route('/forum/<model("forum.forum"):forum>/post/<model("forum.post"):post>/upvote', type='json', auth="public", website=True)
    def post_upvote(self, forum, post, **kwargs):