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Edit File: wpbc-class-upgrader-translation-skin.php

<?php
/**
 * @version    1.0
 * @package    Booking Calendar
 * @subpackage Translations Functions
 * @category   Functions
 *
 * @author     wpdevelop
 * @link       https://wpbookingcalendar.com/
 * @email info@wpbookingcalendar.com
 *
 * @modified   29.09.2015
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}                                             // Exit if accessed directly.

require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';

class WPBC_Upgrader_Translation_Skin extends WP_Upgrader_Skin {

function __construct( $args = array() ) {
		$defaults      = array(
			'url'     => '',
			'nonce'   => '',
			'title'   => '',
			'context' => false,
		);
		$this->options = wp_parse_args( $args, $defaults );
	}

function header() {}

function footer() {}

function error( $error ) {
		$this->installer_error = $error;
	}

function add_strings() {
		$this->upgrader->strings['starting_upgrade'] = __( 'Some of your translations need updating. Sit tight for a few more seconds while we update them as well.', 'booking' );
		$this->upgrader->strings['up_to_date']       = __( 'Your translations are all up to date.', 'booking' );
		$this->upgrader->strings['no_package']       = __( 'Update package not available.', 'booking' );
		/* translators: %s: Package URL. */
		$this->upgrader->strings['downloading_package'] = sprintf( __( 'Downloading translation from %s&#8230;', 'booking' ), '<span class="code">%s</span>' );
		$this->upgrader->strings['unpack_package']      = __( 'Unpacking the update&#8230;', 'booking' );
		$this->upgrader->strings['process_failed']      = __( 'Translation update failed.', 'booking' );
		$this->upgrader->strings['process_success']     = __( 'Translation updated successfully.', 'booking' );
		$this->upgrader->strings['remove_old']          = __( 'Removing the old version of the translation&#8230;', 'booking' );
		$this->upgrader->strings['remove_old_failed']   = __( 'Could not remove the old translation.', 'booking' );

}

public function set_upgrader( &$upgrader ) {
		if ( is_object( $upgrader ) ) {
			$this->upgrader =& $upgrader;
		}
		$this->add_strings();
	}

function before() {}

function after() {
		if ( ! empty( $this->installer_error ) ) {
			if ( is_wp_error( $this->installer_error ) ) {
				$message = $this->installer_error->get_error_message() . ' (' . $this->installer_error->get_error_data() . ')';

echo wp_kses_post( $message );
			}
		}
	}
}

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