list_theme_updates()

function list_theme_updates() {
	$themes = get_theme_updates();
	if ( empty( $themes ) ) {
		echo '<h2>' . __( 'Themes' ) . '</h2>';
		echo '<p>' . __( 'Your themes are all up to date.' ) . '</p>';
		return;
	}

	$form_action = 'update-core.php?action=do-theme-upgrade';
?>
<h2><?php _e( 'Themes' ); ?></h2>
<p><?php _e( 'The following themes have new versions available. Check the ones you want to update and then click &#8220;Update Themes&#8221;.' ); ?></p>
<p><?php printf( __( '<strong>Please Note:</strong> Any customizations you have made to theme files will be lost. Please consider using <a href="%s">child themes</a> for modifications.' ), __( 'https://codex.wordpress.org/Child_Themes' ) ); ?></p>
<form method="post" action="<?php echo esc_url( $form_action ); ?>" name="upgrade-themes" class="upgrade">
<?php wp_nonce_field('upgrade-core'); ?>
<p><input id="upgrade-themes" class="button" type="submit" value="<?php esc_attr_e('Update Themes'); ?>" name="upgrade" /></p>
<table class="widefat updates-table" id="update-themes-table">
	<thead>
	<tr>
		<td class="manage-column check-column"><input type="checkbox" id="themes-select-all" /></td>
		<td class="manage-column"><label for="themes-select-all"><?php _e( 'Select All' ); ?></label></td>
	</tr>
	</thead>

	<tbody class="plugins">
<?php
	foreach ( $themes as $stylesheet => $theme ) {
		$checkbox_id = 'checkbox_' . md5( $theme->get( 'Name' ) );
		?>
		<tr>
			<td class="check-column">
				<input type="checkbox" name="checked[]" id="<?php echo $checkbox_id; ?>" value="<?php echo esc_attr( $stylesheet ); ?>" />
				<label for="<?php echo $checkbox_id; ?>" class="screen-reader-text"><?php
					/* translators: %s: theme name */
					printf( __( 'Select %s' ),
						$theme->display( 'Name' )
					);
				?></label>
			</td>
			<td class="plugin-title"><p>
				<img src="<?php echo esc_url( $theme->get_screenshot() ); ?>" width="85" height="64" class="updates-table-screenshot" alt="" />
				<strong><?php echo $theme->display( 'Name' ); ?></strong>
				<?php
					/* translators: 1: theme version, 2: new version */
					printf( __( 'You have version %1$s installed. Update to %2$s.' ),
						$theme->display( 'Version' ),
						$theme->update['new_version']
					);
				?>
			</p></td>
		</tr>
		<?php
	}
?>
	</tbody>

	<tfoot>
	<tr>
		<td class="manage-column check-column"><input type="checkbox" id="themes-select-all-2" /></td>
		<td class="manage-column"><label for="themes-select-all-2"><?php _e( 'Select All' ); ?></label></td>
	</tr>
	</tfoot>
</table>
<p><input id="upgrade-themes-2" class="button" type="submit" value="<?php esc_attr_e('Update Themes'); ?>" name="upgrade" /></p>
</form>
<?php
}