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wp-includes\default-widgets.php

579行辺り
sprintf( ‘

‘,
↓
sprintf( ‘

‘,
変更

echo apply_filters( ‘widget_meta_poweredby’, sprintf( ‘

‘,

esc_url( __( ‘https://wordpress.org/’ ) ),
esc_attr__( ‘Powered by WordPress, state-of-the-art semantic personal publishing platform.’ ),
_x( ‘WordPress.org’, ‘meta widget link text’ )