[BUG] Puzzles are not escaped in admin panel

[fbuys]

We need to escape puzzles in the admin panel.

Current behavior:

• Puzzles might inlude valid html
• Puzzles are displayed, but html it displayed in the browser unescaped
• Below Edit Post should be a link display as html text not interpreted by the browser:

Expected behavior

• Any html/JS/CSS should be escaped and displayed as text (not be rendered/interpreted by the browser)