feat(search): add NL search frontend i18n keys (de/en/es)

Toggle labels, loading panel, error panels (503/429), empty-state
retry, chip type-prefixes + remove label, and disambiguation strings
for the smart search UI (#739). Formal Sie form per project standard.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/messages/de.json

@@ -25,6 +25,28 @@
 	"error_smart_search_unavailable": "Die intelligente Suche ist momentan nicht verfügbar. Bitte nutzen Sie die normale Suche.",
 	"error_smart_search_rate_limited": "Sie haben die Suchfunktion zu häufig genutzt. Bitte warten Sie eine Minute.",
 	"smart_search_keywords_not_applied": "Schlüsselwörter konnten bei dieser Suche nicht berücksichtigt werden.",
+	"search_toggle_smart_label": "KI",
+	"search_toggle_smart_label_suffix": "-Suche",
+	"search_toggle_keyword_label": "Text",
+	"search_toggle_keyword_label_suffix": "suche",
+	"search_loading_nl": "Archiv wird befragt…",
+	"search_loading_nl_sub": "Die KI analysiert Ihre Anfrage. Das kann bis zu 15 Sekunden dauern.",
+	"search_error_unavailable": "Intelligente Suche nicht verfügbar",
+	"search_error_unavailable_body": "Die KI-Suche ist momentan nicht erreichbar. Sie können Ihre Anfrage als einfache Volltextsuche wiederholen.",
+	"search_switch_to_keyword": "Zur Volltextsuche wechseln",
+	"search_error_rate_limited": "Zu viele Anfragen",
+	"search_error_rate_limited_body": "Sie haben die intelligente Suche zu häufig genutzt. Bitte warten Sie eine Minute und versuchen Sie es erneut.",
+	"search_empty_nl": "Keine Ergebnisse",
+	"search_empty_retry_keyword": "Als Volltextsuche wiederholen",
+	"search_filter_remove_label": "Filter entfernen: {label}",
+	"search_chip_sender": "Absender",
+	"search_chip_date": "Zeitraum",
+	"search_chip_keyword": "Stichwort",
+	"search_chip_directional_label": "Von {from} zu {to}, Filter entfernen",
+	"search_disambiguation_trigger_label": "Mehrere Personen gefunden — zum Auswählen klicken",
+	"search_disambiguation_cue": "(auswählen…)",
+	"search_disambiguation_heading": "Person auswählen",
+	"search_disambiguation_select_label": "{name} auswählen",
 	"error_validation_error": "Die Eingabe ist ungültig.",
 	"error_internal_error": "Ein unerwarteter Fehler ist aufgetreten.",
 	"nav_documents": "Dokumente",

frontend/messages/en.json

@@ -25,6 +25,28 @@
 	"error_smart_search_unavailable": "The smart search is currently unavailable. Please use the regular search.",
 	"error_smart_search_rate_limited": "You have used the search function too frequently. Please wait a minute.",
 	"smart_search_keywords_not_applied": "Keywords could not be applied to this search.",
+	"search_toggle_smart_label": "AI",
+	"search_toggle_smart_label_suffix": " search",
+	"search_toggle_keyword_label": "Text",
+	"search_toggle_keyword_label_suffix": " search",
+	"search_loading_nl": "Querying the archive…",
+	"search_loading_nl_sub": "The AI is analysing your request. This can take up to 15 seconds.",
+	"search_error_unavailable": "Smart search unavailable",
+	"search_error_unavailable_body": "The AI search is currently unreachable. You can repeat your request as a plain full-text search.",
+	"search_switch_to_keyword": "Switch to full-text search",
+	"search_error_rate_limited": "Too many requests",
+	"search_error_rate_limited_body": "You have used the smart search too frequently. Please wait a minute and try again.",
+	"search_empty_nl": "No results",
+	"search_empty_retry_keyword": "Repeat as full-text search",
+	"search_filter_remove_label": "Remove filter: {label}",
+	"search_chip_sender": "Sender",
+	"search_chip_date": "Period",
+	"search_chip_keyword": "Keyword",
+	"search_chip_directional_label": "From {from} to {to}, remove filter",
+	"search_disambiguation_trigger_label": "Several people found — click to choose",
+	"search_disambiguation_cue": "(choose…)",
+	"search_disambiguation_heading": "Choose a person",
+	"search_disambiguation_select_label": "Select {name}",
 	"error_validation_error": "The input is invalid.",
 	"error_internal_error": "An unexpected error occurred.",
 	"nav_documents": "Documents",

frontend/messages/es.json

@@ -25,6 +25,28 @@
 	"error_smart_search_unavailable": "La búsqueda inteligente no está disponible en este momento. Por favor, usa la búsqueda normal.",
 	"error_smart_search_rate_limited": "Has utilizado la función de búsqueda demasiadas veces. Por favor, espera un minuto.",
 	"smart_search_keywords_not_applied": "Las palabras clave no pudieron aplicarse a esta búsqueda.",
+	"search_toggle_smart_label": "IA",
+	"search_toggle_smart_label_suffix": " búsqueda",
+	"search_toggle_keyword_label": "Texto",
+	"search_toggle_keyword_label_suffix": " búsqueda",
+	"search_loading_nl": "Consultando el archivo…",
+	"search_loading_nl_sub": "La IA está analizando su solicitud. Esto puede tardar hasta 15 segundos.",
+	"search_error_unavailable": "Búsqueda inteligente no disponible",
+	"search_error_unavailable_body": "La búsqueda con IA no está disponible en este momento. Puede repetir su solicitud como una búsqueda de texto completo.",
+	"search_switch_to_keyword": "Cambiar a búsqueda de texto completo",
+	"search_error_rate_limited": "Demasiadas solicitudes",
+	"search_error_rate_limited_body": "Ha utilizado la búsqueda inteligente con demasiada frecuencia. Espere un minuto e inténtelo de nuevo.",
+	"search_empty_nl": "Sin resultados",
+	"search_empty_retry_keyword": "Repetir como búsqueda de texto completo",
+	"search_filter_remove_label": "Eliminar filtro: {label}",
+	"search_chip_sender": "Remitente",
+	"search_chip_date": "Período",
+	"search_chip_keyword": "Palabra clave",
+	"search_chip_directional_label": "De {from} a {to}, eliminar filtro",
+	"search_disambiguation_trigger_label": "Se encontraron varias personas — haga clic para elegir",
+	"search_disambiguation_cue": "(elegir…)",
+	"search_disambiguation_heading": "Elegir una persona",
+	"search_disambiguation_select_label": "Seleccionar {name}",
 	"error_validation_error": "La entrada no es válida.",
 	"error_internal_error": "Se ha producido un error inesperado.",
 	"nav_documents": "Documentos",