Improve message handling in the simple theme editor

[andrewpai]

Improve message handling in the simple theme editor

Some things to add

• Have message edits show in real time in the message preview
• Give an indication that the theme needs to be saved after editing messages
• Provide a better UI for editing messages
  • Consider not using a code editor, or if we leave it, add vi bindings :-)
  • Consider providing a view with just the messages that show up on the current template. If we do this, we probably need to be able to cycle through templates from this view

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Testing.

[andrewpai]

Closing, as much of this is handled by

• https://github.com/FusionAuth/fusionauth-issues/issues/2778