Added mention bbcode - fixes #942

Signed-off-by: emanuele <emanuele45@gmail.com>
Seems a duplicate

Signed-off-by: emanuele <emanuele45@gmail.com>
Revalidate mentions on form submit (fixes #941) and fix some of the issues in WYSIWYG (Opera is broken when in quickreply+WYSIWYG)

Signed-off-by: emanuele <emanuele45@gmail.com>
Merge pull request #950 from emanuele45/notifications_additions

Notifications additions