feat(housekeeping): complete content events workflow

src/messages/ja.json

@@ -270,13 +270,15 @@
 							"change": "Event Prize change · Change"
 						},
 						"event-type": {
-							"change": "Event Type change · Change"
+							"change": "Event Type change · Change",
+							"delete": "イベントタイプ · 削除"
 						},
 						"event-winner": {
 							"add": "Event Winner add · Add"
 						},
 						"event": {
-							"change": "Event · Change"
+							"change": "Event · Change",
+							"delete": "イベント · 削除"
 						},
 						"poll-question": {
 							"change": "Poll Question change · Change"