New translations en.json (Japanese)

src/client/messages/ja-JP.json

@@ -87,5 +87,17 @@
         "subtitle": "アプリをアンインストールして負荷を軽減する"
       }
     }
+  },
+  "header": {
+    "dashboard": "Dashboard",
+    "my-apps": "My Apps",
+    "app-store": "App Store",
+    "settings": "Settings",
+    "logout": "Logout",
+    "dark-mode": "Dark Mode",
+    "light-mode": "Light Mode",
+    "sponsor": "Sponsor",
+    "source-code": "Source code",
+    "update-available": "Update available"
   }
 }