R1:5954ae84aa7e

Improve Herald personal/global UI/UX

Summary:
- Default "personal" vs "global" choice to "personal".
- Don't show global rules under "My Rules".
- After editing or creating a global rule, redirect back to global rule list.
- Use radio buttons for "personal" vs "global" and add captions explaining the
difference.
- For "global" rules, don't show the owner/author in the rule detail view --
they effectively have no owner (see also D1387).
- For "global" rules, don't show the owner/author in the…