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/en.json

@@ -838,12 +838,35 @@
 			"events": {
 				"newEvent": "+ New event",
 				"createTitle": "Create event",
-				"createSubtitle": "Schedule a new hotel event"
+				"createSubtitle": "Schedule a new hotel event",
+				"searchPlaceholder": "Search events…",
+				"colId": "ID",
+				"colTitle": "Title",
+				"colType": "Type",
+				"colStarts": "Starts",
+				"colStatus": "Status",
+				"colActions": "Actions",
+				"statusPublished": "Published",
+				"statusDraft": "Draft",
+				"statusCancelled": "Cancelled",
+				"statusCompleted": "Completed"
 			},
 			"polls": {
 				"newPoll": "+ New poll",
 				"createTitle": "Create poll",
-				"createSubtitle": "Create a new community poll or survey"
+				"createSubtitle": "Create a new community poll or survey",
+				"searchPlaceholder": "Search polls…",
+				"colId": "ID",
+				"colTitle": "Title",
+				"colStatus": "Status",
+				"colType": "Type",
+				"colCreated": "Created",
+				"colActions": "Actions",
+				"statusActive": "Active",
+				"statusDraft": "Draft",
+				"statusClosed": "Closed",
+				"typeMultiple": "Multiple choice",
+				"typeSingle": "Single choice"
 			},
 			"multiAccounts": {
 				"minAccounts": "Min accounts per cluster",