chore(i18n): drop dead navigation.customers keys

frontend/src/components/admin/CustomerAccountPicker.tsx

@@ -175,7 +175,7 @@ export const CustomerAccountPicker: React.FC<Props> = ({ value, onChange, disabl
             </div>
           ) : results.length === 0 ? (
             <div className="px-3 py-3 text-sm text-muted-theme">
-              {t('events.customerPicker.noResults', 'No matches. Invite this customer from /admin/customers first.')}
+              {t('events.customerPicker.noResults', 'No matches. Invite this customer from Clients → Accounts first.')}
             </div>
           ) : (
             <ul role="listbox">

frontend/src/i18n/locales/de.json

@@ -168,7 +168,6 @@
     "cmsPages": "CMS-Seiten",
     "users": "Benutzer",
     "calendar": "Kalender",
-    "customers": "Kunden",
     "clients": "Kunden"
   },
   "eventTypes": {

frontend/src/i18n/locales/en.json

@@ -168,7 +168,6 @@
     "cmsPages": "CMS Pages",
     "users": "Users",
     "calendar": "Calendar",
-    "customers": "Customers",
     "clients": "Clients"
   },
   "archives": {

frontend/src/i18n/locales/fr.json

@@ -169,7 +169,6 @@
     "backup": "Sauvegarde et Restauration",
     "cmsPages": "Pages CMS",
     "users": "Utilisateurs",
-    "customers": "Clients",
     "clients": "Clients"
   },
   "archives": {

frontend/src/i18n/locales/nl.json

@@ -168,7 +168,6 @@
     "cmsPages": "CMS-pagina's",
     "users": "Gebruikers",
     "calendar": "Agenda",
-    "customers": "Klanten",
     "clients": "Klanten"
   },
   "archives": {

frontend/src/i18n/locales/pt.json

@@ -171,7 +171,6 @@
     "cmsPages": "Páginas CMS",
     "users": "Utilizadores",
     "calendar": "Calendário",
-    "customers": "Clientes",
     "clients": "Clientes"
   },
   "archives": {

frontend/src/i18n/locales/ru.json

@@ -174,7 +174,6 @@
     "cmsPages": "CMS-страницы",
     "users": "Пользователи",
     "calendar": "Календарь",
-    "customers": "Клиенты",
     "clients": "Клиенты"
   },
   "archives": {