[Update/bugfix] Notification UI:

Adjust an animation.
Add localizations.
Fix stack behavior that was not updated correctly. (it still has an issue tho.)

locales/en.yml

@@ -269,6 +269,9 @@ config_page:
         websocket_port:
             label: "WebSocket Port"
 
+    notifications:
+        save_success: "Settings have been saved"
+
 plugin_notifications:
     downloading: Downloading the plugin.
     downloaded_success: Downloaded successfully.

locales/ja.yml

@@ -269,6 +269,9 @@ config_page:
         websocket_port:
             label: "WebSocket Port"
 
+    notifications:
+        save_success: "設定を保存しました。"
+
 plugin_notifications:
     downloading: プラグインをダウンロード中。
     downloaded_success: プラグインのダウンロードが完了しました。