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/en/common.json

@@ -139,7 +139,58 @@
     "associationTemplates": "Shared Templates",
     "administration": "Administration",
     "accountSettings": "Account Settings",
-    "application": "Application"
+    "application": "Application",
+    "courses": "Courses",
+    "calendar": "Calendar",
+    "instructors": "Instructors",
+    "locations": "Locations",
+    "categories": "Categories",
+    "statistics": "Statistics",
+    "events": "Events",
+    "registrations": "Registrations",
+    "holiday passes": "Holiday Passes",
+    "bookings": "Bookings",
+    "rooms": "Rooms",
+    "guests": "Guests",
+    "finance": "Finance",
+    "invoices": "Invoices",
+    "sepa": "SEPA",
+    "payments": "Payments",
+    "documents": "Documents",
+    "generate": "Generate",
+    "templates": "Templates",
+    "newsletter": "Newsletter",
+    "new": "New",
+    "edit": "Edit",
+    "members": "Members",
+    "members cms": "Members",
+    "site builder": "Site Builder",
+    "posts": "Posts",
+    "fischerei": "Fisheries",
+    "waters": "Waters",
+    "species": "Species",
+    "stocking": "Stocking",
+    "leases": "Leases",
+    "catch books": "Catch Books",
+    "permits": "Permits",
+    "competitions": "Competitions",
+    "meetings": "Meetings",
+    "protocols": "Protocols",
+    "tasks": "Tasks",
+    "verband": "Federation",
+    "clubs": "Clubs",
+    "hierarchy": "Hierarchy",
+    "reporting": "Reporting",
+    "modules": "Modules",
+    "import": "Import",
+    "applications": "Applications",
+    "departments": "Departments",
+    "dues": "Dues",
+    "tags": "Tags",
+    "cards": "Cards",
+    "invitations": "Invitations",
+    "attendance": "Attendance",
+    "participants": "Participants"
   },
   "roles": {
     "owner": {
@@ -223,4 +274,4 @@
     "action": "Go to Dashboard"
   },
   "confirm": "Confirm"
-}
+}