Resolve #3581 (#3589)

* Update ja-JP.yml

* Create 404.vue

* Update script.ts

* Update script.ts

* Update script.ts

* Update script.ts

* Update script.ts

* Update script.ts

* Update 404.vue

* Update meta.ts

* Update instance.vue

* Update update-meta.ts

src/client/app/dev/script.ts

@@ -18,6 +18,7 @@ import Apps from './views/apps.vue';
 import AppNew from './views/new-app.vue';
 import App from './views/app.vue';
 import ui from './views/ui.vue';
+import NotFound from '../common/views/pages/404.vue';
 
 Vue.use(BootstrapVue);
 
@@ -36,6 +37,7 @@ init(launch => {
 			{ path: '/apps', component: Apps },
 			{ path: '/app/new', component: AppNew },
 			{ path: '/app/:id', component: App },
+			{ path: '*', component: NotFound }
 		]
 	});