diff -r 7b1b88e27a20 -r 48c4eec2b7e6 wp/wp-admin/network/site-themes.php
--- a/wp/wp-admin/network/site-themes.php	Thu Sep 29 08:06:27 2022 +0200
+++ b/wp/wp-admin/network/site-themes.php	Fri Sep 05 18:40:08 2025 +0200
@@ -173,7 +173,8 @@
 $parent_file  = 'sites.php';
 $submenu_file = 'sites.php';
 
-require_once ABSPATH . 'wp-admin/admin-header.php'; ?>
+require_once ABSPATH . 'wp-admin/admin-header.php';
+?>
 
 <div class="wrap">
 <h1 id="edit-site"><?php echo $title; ?></h1>
@@ -195,7 +196,15 @@
 		/* translators: %s: Number of themes. */
 		$message = _n( '%s theme enabled.', '%s themes enabled.', $enabled );
 	}
-	echo '<div id="message" class="updated notice is-dismissible"><p>' . sprintf( $message, number_format_i18n( $enabled ) ) . '</p></div>';
+
+	wp_admin_notice(
+		sprintf( $message, number_format_i18n( $enabled ) ),
+		array(
+			'type'        => 'success',
+			'dismissible' => true,
+			'id'          => 'message',
+		)
+	);
 } elseif ( isset( $_GET['disabled'] ) ) {
 	$disabled = absint( $_GET['disabled'] );
 	if ( 1 === $disabled ) {
@@ -204,16 +213,31 @@
 		/* translators: %s: Number of themes. */
 		$message = _n( '%s theme disabled.', '%s themes disabled.', $disabled );
 	}
-	echo '<div id="message" class="updated notice is-dismissible"><p>' . sprintf( $message, number_format_i18n( $disabled ) ) . '</p></div>';
+
+	wp_admin_notice(
+		sprintf( $message, number_format_i18n( $disabled ) ),
+		array(
+			'type'        => 'success',
+			'dismissible' => true,
+			'id'          => 'message',
+		)
+	);
 } elseif ( isset( $_GET['error'] ) && 'none' === $_GET['error'] ) {
-	echo '<div id="message" class="error notice is-dismissible"><p>' . __( 'No theme selected.' ) . '</p></div>';
+	wp_admin_notice(
+		__( 'No theme selected.' ),
+		array(
+			'type'        => 'error',
+			'dismissible' => true,
+			'id'          => 'message',
+		)
+	);
 }
 ?>
 
 <p><?php _e( 'Network enabled themes are not shown on this screen.' ); ?></p>
 
 <form method="get">
-<?php $wp_list_table->search_box( __( 'Search Installed Themes' ), 'theme' ); ?>
+<?php $wp_list_table->search_box( __( 'Search installed themes' ), 'theme' ); ?>
 <input type="hidden" name="id" value="<?php echo esc_attr( $id ); ?>" />
 </form>