Bug fixes / Support for WP5.8 widget block editor

【Contents of the fix】
■Fixed a bug in WP5.8 that the setting field is not displayed after changing the fixed page template when using the block editor.
■Support for WP5.8 widget block editor

【Modified files】
admin/js/my_script.js
languages/ja.mo
languages/ja.po
functions.php
style.css

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