Cleanup next_previous edit dialog (#3842)
Cleanup next_previous edit dialog (#3842)

* Cleanup form_setup_html

- Properly close fieldset
- Replace htmlentities with h helper
- Use form helper for form fields

* PSR / Readability form_setup_html


Former-commit-id: 767d9f60ecf36579742404510d33aae6994412a1
Former-commit-id: 35a4fb41ce664fd7615ac0a281f2496c1b3ed850
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