fix: UX improvements for German association users

- fix(member-detail): display gender in German (Männlich/Weiblich/Divers)
  instead of raw English enum values (male/female/diverse)

- fix(member-detail): display country names in German (Österreich, Deutschland)
  instead of raw ISO codes (AT, DE)

- fix(member-statistics): total member count was always 0
  getStatistics() returns per-status counts without a total key;
  now computes total by summing all status counts

- fix(i18n): add 56 breadcrumb segment translations for DE and EN
  Breadcrumbs were showing English path segments (Courses, Calendar,
  Registrations) because translation keys for URL path segments were
  missing. Added all segment-level route translations so breadcrumbs
  now display in German throughout the app.

apps/web/i18n/messages/de/common.json

@@ -139,7 +139,58 @@
     "administration": "Administration",
     "accountSettings": "Kontoeinstellungen",
     "application": "Anwendung",
-    "home": "Startseite"
+    "home": "Startseite",
+    "courses": "Kurse",
+    "calendar": "Kalender",
+    "instructors": "Kursleiter",
+    "locations": "Standorte",
+    "categories": "Kategorien",
+    "statistics": "Statistiken",
+    "events": "Veranstaltungen",
+    "registrations": "Anmeldungen",
+    "holiday passes": "Ferienpässe",
+    "bookings": "Buchungen",
+    "rooms": "Zimmer",
+    "guests": "Gäste",
+    "finance": "Finanzen",
+    "invoices": "Rechnungen",
+    "sepa": "SEPA-Einzüge",
+    "payments": "Zahlungen",
+    "documents": "Dokumente",
+    "generate": "Generieren",
+    "templates": "Vorlagen",
+    "newsletter": "Newsletter",
+    "new": "Neu",
+    "edit": "Bearbeiten",
+    "members": "Mitglieder",
+    "members cms": "Vereinsmitglieder",
+    "site builder": "Website",
+    "posts": "Beiträge",
+    "fischerei": "Fischerei",
+    "waters": "Gewässer",
+    "species": "Fischarten",
+    "stocking": "Besatz",
+    "leases": "Pachten",
+    "catch books": "Fangbücher",
+    "permits": "Erlaubnisscheine",
+    "competitions": "Wettbewerbe",
+    "meetings": "Sitzungen",
+    "protocols": "Protokolle",
+    "tasks": "Aufgaben",
+    "verband": "Verband",
+    "clubs": "Vereine",
+    "hierarchy": "Organisationsstruktur",
+    "reporting": "Berichte",
+    "modules": "Module",
+    "import": "Import",
+    "applications": "Aufnahmeanträge",
+    "departments": "Abteilungen",
+    "dues": "Beiträge",
+    "tags": "Tags",
+    "cards": "Mitgliedsausweise",
+    "invitations": "Einladungen",
+    "attendance": "Anwesenheit",
+    "participants": "Teilnehmer"
   },
   "roles": {
     "owner": {
@@ -223,4 +274,4 @@
     "action": "Zum Dashboard"
   },
   "confirm": "Bestätigen"
-}
+}