Fix "addthis" URL sharing to avoid using hash tag.

1. On sharing, we replace the # with /.
2. When the server receives the /, it returns the appropriate OG tags
and redirects back to the URL with the hash tag.
3. Added a 200x200 square logo.
Add the same logic to interlinear.
Put meta inside head instead of body.
Fix og tags.
Don't redirect on facebook user agent.
Fix final redirection.
Fix share widget.
Remove alert.