Textdomain is not correct

Please note:
https://developer.wordpress.org/plugins/internationalization/how-to-internationalize-your-plugin/#text-domains

For example:
Change
_e( ‘Hide in Nested Pages’, ‘nestedpages’ );
to
_e( ‘Hide in Nested Pages’, ‘wp-nested-pages’ );

Language files are not currently included at the moment.