i18n(approvals): t-paliad-216 Slice C — Verlauf labels for changes_suggested

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.

frontend/src/client/i18n.ts

@@ -972,18 +972,22 @@ const translations: Record<Lang, Record<string, string>> = {
     "event.title.deadline_approval_approved": "Genehmigung erteilt",
     "event.title.deadline_approval_rejected": "Genehmigung abgelehnt",
     "event.title.deadline_approval_revoked": "Anfrage zurückgezogen",
+    "event.title.deadline_approval_changes_suggested": "Änderungen vorgeschlagen",
     "event.title.appointment_approval_requested": "Genehmigung beantragt",
     "event.title.appointment_approval_approved": "Genehmigung erteilt",
     "event.title.appointment_approval_rejected": "Genehmigung abgelehnt",
     "event.title.appointment_approval_revoked": "Anfrage zurückgezogen",
+    "event.title.appointment_approval_changes_suggested": "Änderungen vorgeschlagen",
     "event.description.deadline_approval_requested": "4-Augen-Genehmigung für Frist beantragt",
     "event.description.deadline_approval_approved": "Genehmigung für Frist erteilt",
     "event.description.deadline_approval_rejected": "Genehmigung für Frist abgelehnt",
     "event.description.deadline_approval_revoked": "Genehmigungsanfrage für Frist zurückgezogen",
+    "event.description.deadline_approval_changes_suggested": "Frist abgelehnt mit Gegenvorschlag",
     "event.description.appointment_approval_requested": "4-Augen-Genehmigung für Termin beantragt",
     "event.description.appointment_approval_approved": "Genehmigung für Termin erteilt",
     "event.description.appointment_approval_rejected": "Genehmigung für Termin abgelehnt",
     "event.description.appointment_approval_revoked": "Genehmigungsanfrage für Termin zurückgezogen",
+    "event.description.appointment_approval_changes_suggested": "Termin abgelehnt mit Gegenvorschlag",
     "dashboard.action.short.deadline_approval_requested": "beantragte Genehmigung",
     "dashboard.action.short.deadline_approval_approved": "genehmigte Frist",
     "dashboard.action.short.deadline_approval_rejected": "lehnte Frist ab",
@@ -3585,18 +3589,22 @@ const translations: Record<Lang, Record<string, string>> = {
     "event.title.deadline_approval_approved": "Approval granted",
     "event.title.deadline_approval_rejected": "Approval rejected",
     "event.title.deadline_approval_revoked": "Request revoked",
+    "event.title.deadline_approval_changes_suggested": "Changes suggested",
     "event.title.appointment_approval_requested": "Approval requested",
     "event.title.appointment_approval_approved": "Approval granted",
     "event.title.appointment_approval_rejected": "Approval rejected",
     "event.title.appointment_approval_revoked": "Request revoked",
+    "event.title.appointment_approval_changes_suggested": "Changes suggested",
     "event.description.deadline_approval_requested": "Four-eyes approval requested for deadline",
     "event.description.deadline_approval_approved": "Deadline approval granted",
     "event.description.deadline_approval_rejected": "Deadline approval rejected",
     "event.description.deadline_approval_revoked": "Deadline approval request revoked",
+    "event.description.deadline_approval_changes_suggested": "Deadline declined with a counter-proposal",
     "event.description.appointment_approval_requested": "Four-eyes approval requested for appointment",
     "event.description.appointment_approval_approved": "Appointment approval granted",
     "event.description.appointment_approval_rejected": "Appointment approval rejected",
     "event.description.appointment_approval_revoked": "Appointment approval request revoked",
+    "event.description.appointment_approval_changes_suggested": "Appointment declined with a counter-proposal",
     "dashboard.action.short.deadline_approval_requested": "requested approval",
     "dashboard.action.short.deadline_approval_approved": "approved deadline",
     "dashboard.action.short.deadline_approval_rejected": "rejected deadline",

frontend/src/i18n-keys.ts

@@ -1301,6 +1301,7 @@ export type I18nKey =
   | "einstellungen.tab.profil"
   | "einstellungen.title"
   | "event.description.appointment_approval_approved"
+  | "event.description.appointment_approval_changes_suggested"
   | "event.description.appointment_approval_rejected"
   | "event.description.appointment_approval_requested"
   | "event.description.appointment_approval_revoked"
@@ -1309,6 +1310,7 @@ export type I18nKey =
   | "event.description.appointment_project_changed"
   | "event.description.appointment_updated"
   | "event.description.deadline_approval_approved"
+  | "event.description.deadline_approval_changes_suggested"
   | "event.description.deadline_approval_rejected"
   | "event.description.deadline_approval_requested"
   | "event.description.deadline_approval_revoked"
@@ -1324,6 +1326,7 @@ export type I18nKey =
   | "event.note.parent.deadline"
   | "event.note.parent.project"
   | "event.title.appointment_approval_approved"
+  | "event.title.appointment_approval_changes_suggested"
   | "event.title.appointment_approval_rejected"
   | "event.title.appointment_approval_requested"
   | "event.title.appointment_approval_revoked"
@@ -1338,6 +1341,7 @@ export type I18nKey =
   | "event.title.checklist_reset"
   | "event.title.checklist_unlinked"
   | "event.title.deadline_approval_approved"
+  | "event.title.deadline_approval_changes_suggested"
   | "event.title.deadline_approval_rejected"
   | "event.title.deadline_approval_requested"
   | "event.title.deadline_approval_revoked"