Add locals en-US and ja-JP (machine translated)

locales/en-US.yml

@@ -2431,6 +2431,7 @@ _notification:
     roleAssigned: "Role given"
     achievementEarned: "Achievement unlocked"
     app: "Notifications from linked apps"
+    edited: "Edits"
   _actions:
     followBack: "followed you back"
     reply: "Reply"

locales/ja-JP.yml

@@ -2489,6 +2489,7 @@ _notification:
     roleAssigned: "ロールが付与された"
     achievementEarned: "実績の獲得"
     app: "連携アプリからの通知"
+    edited: "編集済み"
 
   _actions:
     followBack: "フォローバック"