Adds the DE + EN event title + description keys for the two new
*_approval_changes_suggested event_types emitted by SuggestChanges
(Slice A). The existing translateEvent() helper picks up
event.title.{event_type} and event.description.{event_type} keys by
convention — no renderer code changes are needed; this slice is pure i18n.
Surfaces covered:
- projects-detail.ts Verlauf tab (per-project timeline)
- admin-audit-log.ts admin audit table
Both call translateEvent() which now resolves the new keys.
No icon system is tied to event_type slugs; no server-side event_types
registry needs the new types pre-registered (the slugs are emitted into
project_events.event_type as free text by the service layer, then
localised at read time).
This is the final slice for t-paliad-216. Slice A (mig 103 + service +
handler + tests), Slice B (frontend modal + /inbox UI + back-link
hydration), Slice C (Verlauf i18n) all on main now.