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 not request.session.uid:
            return {'error': 'anonymous_user'}
        if request.uid == post.create_uid.id:
            return {'error': 'own_post'}
        upvote = True if not post.user_vote > 0 else False
        return post.vote(upvote=upvote)
    @http.route('/forum/<model("forum.forum"):forum>/post/<model("forum.post"):post>/downvote', type='json', auth="public", website=True)
    def post_downvote(self, forum, post, **kwargs):
        if not request.session.uid:
            return {'error': 'anonymous_user'}
        if request.uid == post.create_uid.id:
            return {'error': 'own_post'}
        upvote = True if post.user_vote < 0 else False
        return post.vote(upvote=upvote)
    @http.route('/forum/post/bump', type='json', auth="public", website=True)
    def post_bump(self, post_id, **kwarg):
        post = request.env['forum.post'].browse(int(post_id))
        if not post.exists() or post.parent_id:
            return False
        return post.bump()
    
    
    @http.route('/forum/<model("forum.forum"):forum>/validation_queue', type='http', auth="user", website=True)
    def validation_queue(self, forum):