Mirrors the notification-template page's group layout. Command slots
now split by name prefix into Command Responses, Error Messages
(rate_limited/no_results), Command Descriptions (desc_*), and Usage
Examples (usage_*). Language picker, reset-all, and slot filter are
hoisted above the groups so they apply across all fieldsets, and
empty groups are hidden so providers without usage_* don't render
empty headers.
Drops the orphan cmdTemplateConfig.commandResponsesHint i18n key —
hints.commandResponses replaces it.
alexei.dolgolyov
04c8e3c8b2