chore(i18n): delete unused journey_item_pending_add/remove keys

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/messages/de.json

@@ -1194,8 +1194,6 @@
 	"journey_remove_confirm_yes": "Bestätigen",
 	"journey_remove_confirm_cancel": "Abbrechen",
 	"journey_mutation_error_reload": "Aktion fehlgeschlagen – bitte Seite neu laden.",
-	"journey_item_pending_add": "wird hinzugefügt…",
-	"journey_item_pending_remove": "wird entfernt…",
 	"journey_published_empty_warning": "Diese Reise wird ohne Einträge veröffentlicht bleiben.",
 	"journey_intro_placeholder": "Einleitung (optional)",
 	"journey_interlude_placeholder": "Zwischentext eingeben…",

frontend/messages/en.json

@@ -1194,8 +1194,6 @@
 	"journey_remove_confirm_yes": "Confirm",
 	"journey_remove_confirm_cancel": "Cancel",
 	"journey_mutation_error_reload": "Action failed – please reload the page.",
-	"journey_item_pending_add": "adding…",
-	"journey_item_pending_remove": "removing…",
 	"journey_published_empty_warning": "This journey will remain published without any entries.",
 	"journey_intro_placeholder": "Introduction (optional)",
 	"journey_interlude_placeholder": "Enter interlude text…",

frontend/messages/es.json

@@ -1194,8 +1194,6 @@
 	"journey_remove_confirm_yes": "Confirmar",
 	"journey_remove_confirm_cancel": "Cancelar",
 	"journey_mutation_error_reload": "Acción fallida – por favor recarga la página.",
-	"journey_item_pending_add": "añadiendo…",
-	"journey_item_pending_remove": "eliminando…",
 	"journey_published_empty_warning": "Este viaje permanecerá publicado sin entradas.",
 	"journey_intro_placeholder": "Introducción (opcional)",
 	"journey_interlude_placeholder": "Escribe el texto del interludio…",