i18n events and polls admin DataTable columns.

Wire column headers, search placeholders, and status/type labels through pages.admin.events/polls (en/nl/it), matching tickets-table.

Co-authored-by: Cursor <[email protected]>

src/messages/nl.json

@@ -838,12 +838,35 @@
 			"events": {
 				"newEvent": "+ Nieuw evenement",
 				"createTitle": "Evenement aanmaken",
-				"createSubtitle": "Plan een nieuw hotel-evenement"
+				"createSubtitle": "Plan een nieuw hotel-evenement",
+				"searchPlaceholder": "Zoek evenementen…",
+				"colId": "ID",
+				"colTitle": "Titel",
+				"colType": "Type",
+				"colStarts": "Start",
+				"colStatus": "Status",
+				"colActions": "Acties",
+				"statusPublished": "Gepubliceerd",
+				"statusDraft": "Concept",
+				"statusCancelled": "Geannuleerd",
+				"statusCompleted": "Voltooid"
 			},
 			"polls": {
 				"newPoll": "+ Nieuwe poll",
 				"createTitle": "Poll aanmaken",
-				"createSubtitle": "Maak een nieuwe community-poll of enquête"
+				"createSubtitle": "Maak een nieuwe community-poll of enquête",
+				"searchPlaceholder": "Zoek polls…",
+				"colId": "ID",
+				"colTitle": "Titel",
+				"colStatus": "Status",
+				"colType": "Type",
+				"colCreated": "Aangemaakt",
+				"colActions": "Acties",
+				"statusActive": "Actief",
+				"statusDraft": "Concept",
+				"statusClosed": "Gesloten",
+				"typeMultiple": "Meerkeuze",
+				"typeSingle": "Enkele keuze"
 			},
 			"multiAccounts": {
 				"minAccounts": "Min. accounts per cluster",