* DEV: Convert approve_new_topics_unless_trust_level to groups
This change converts the `approve_new_topics_unless_trust_level` site
setting to `approve_new_topics_unless_allowed_groups`.
See: https://meta.discourse.org/t/283408
- Hides the old setting
- Adds the new site setting
- Add a deprecation warning
- Updates to use the new setting
- Adds a migration to fill in the new setting if the old setting was
changed
- Adds an entry to the site_setting.keywords section
- Updates tests to account for the new change
After a couple of months we will remove the
`approve_new_topics_unless_trust_level` setting entirely.
Internal ref: /t/115696
* add missing translation
* Add keyword entry
* Add migration
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