WordPress/wp-admin/about.php

<?php
/**
 * About This Version administration panel.
 *
 * @package WordPress
 * @subpackage Administration
 */

/** WordPress Administration Bootstrap */
require_once( dirname( __FILE__ ) . '/admin.php' );

wp_enqueue_style( 'wp-mediaelement' );
wp_enqueue_script( 'wp-mediaelement' );
wp_localize_script( 'mediaelement', '_wpmejsSettings', array(
	'pluginPath' => includes_url( 'js/mediaelement/', 'relative' ),
	'pauseOtherPlayers' => ''
) );

$title = __( 'About' );

list( $display_version ) = explode( '-', $wp_version );

include( ABSPATH . 'wp-admin/admin-header.php' );

$video_url = 'https://videopress.com/embed/T54Iy7Tw';
$locale    = str_replace( '_', '-', get_locale() );
if ( 'en-AU' !== $locale ) {
	list( $locale ) = explode( '-', $locale );
}
if ( 'en' !== $locale ) {
	$video_url = add_query_arg( 'defaultLangCode', $locale, $video_url );
}

$major_features = array(
	array(
		'src'         => array(
			'mp4'  => '//s.w.org/images/core/4.3/formatting.mp4',
			'ogv'  => '//s.w.org/images/core/4.3/formatting.ogv',
			'webm' => '//s.w.org/images/core/4.3/formatting.webm',
		),
		'heading'     => __( 'Formatting Shortcuts' ),
		/* Translators: 1: asterisks; 2: number sign; */
		'description' => sprintf( __( 'Your writing flow just got faster with new formatting shortcuts in WordPress 4.3. Use asterisks to create lists and number signs to make a heading. No more breaking your flow; your text looks great with a %1$s and a %2$s.' ), '<code>*</code>', '<code>#</code>' ),
	),
	array(
		'src'         => '//s.w.org/images/core/4.3/menu-customizer.png',
		'heading'     => __( 'Menus in the Customizer' ),
		'description' => __( 'Create your menu, update it, and assign it, all while live-previewing in the customizer. The streamlined customizer design provides a mobile-friendly and accessible interface. With every release, it becomes easier and faster to make your site just the way you want it.' ),
	),
	array(
		'src'         => '//s.w.org/images/core/4.3/better-passwords.png',
		'heading'     => __( 'Better Passwords' ),
		'description' => __( 'Keep your site more secure with WordPress&#8217; improved approach to passwords. Instead of receiving passwords via email, you&#8217;ll get a password reset link. When you add new users to your site or edit a user profile, WordPress will automatically generate a secure password.' ),
	),
	array(
		'src'         => '//s.w.org/images/core/4.3/site-icon-customizer.png',
		'heading'     => __( 'Site Icons' ),
		'description' => __( 'Site icons represent your site in browser tabs, bookmark menus, and on the home screen of mobile devices. Add your unique site icon in the customizer; it will even stay in place when you switch themes. Make your whole site reflect your brand.' ),
	),
);
shuffle( $major_features );

$minor_features = array(
	array(
		'src'         => 'data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA0MDAgNDAwIj48cGF0aCBmaWxsPSIjMDBhMGQyIiBkPSJNNTAgMjE1aDI0MHYzMEg1MHpNNTAgMjc1aDI0MHYzMEg1MHpNNTAgMTU1aDI0MHYzMEg1MHpNNTAgOTVoMjQwdjMwSDUwek0zMTAuMSA5NWwxOS45IDMwIDIwLjEtMzAiLz48L3N2Zz4=',
		'heading'     => __( 'A smoother admin experience' ),
		'description' => __( 'Refinements to the list view across the admin make your WordPress more accessible and easier to work with on any device.' ),
	),
	array(
		'src'         => 'data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyMCAyMCI+PHBhdGggZmlsbD0iIzAwYTBkMiIgZD0iTTUgMmgxMHEuODIgMCAxLjQxLjU5VDE3IDR2OHEwIC44Mi0uNTkgMS40MVQxNSAxNGgtMmwtNSA1di01SDVxLS44MiAwLTEuNDEtLjU5VDMgMTJWNHEwLS44Mi41OS0xLjQxVDUgMnptOC41IDguNUwxMSA4bDIuNS0yLjUtMS0xTDEwIDcgNy41IDQuNWwtMSAxTDkgOGwtMi41IDIuNSAxIDFMMTAgOWwyLjUgMi41eiIvPjwvc3ZnPg==',
		'heading'     => __( 'Comments turned off on pages' ),
		'description' => __( 'All new pages that you create will have comments turned off. Keep discussions to your blog, right where they&#8217;re supposed to happen.' ),
	),
	array(
		'src'         => 'data:image/svg+xml;base64,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',
		'heading'     => __( 'Customize your site quickly' ),
		'description' => __( 'Wherever you are on the front-end, you can click the customize link in the toolbar to swiftly make changes to your site.' ),
	),
);

$tech_features = array(
	array(
		'heading'     => __( 'Taxonomy Roadmap' ),
		'description' => __( 'Terms shared across multiple taxonomies are now split into separate terms.' ),
	),
	array(
		'heading'     => __( 'Template Hierarchy' ),
		/* Translators: 1: singular.php; 2: single.php; 3:page.php */
		'description' => sprintf( __( 'Added %1$s as a fallback for %2$s and %3$s' ), '<code>singular.php</code>', '<code>single.php</code>', '<code>page.php</code>' ),
	),
	array(
		'heading'     => '<code>WP_List_Table</code>',
		'description' => __( 'List tables can and should designate a primary column.' ),
	),
);

?>
	<div class="wrap about-wrap">
		<h1><?php printf( __( 'Welcome to WordPress&nbsp;%s' ), $display_version ); ?></h1>

		<div class="about-text"><?php printf( __( 'Thank you for updating! WordPress %s makes it even easier to format your content and customize your site.' ), $display_version ); ?></div>
		<div class="wp-badge"><?php printf( __( 'Version %s' ), $display_version ); ?></div>

		<h2 class="nav-tab-wrapper">
			<a href="about.php" class="nav-tab nav-tab-active"><?php _e( 'What&#8217;s New' ); ?></a>
			<a href="credits.php" class="nav-tab"><?php _e( 'Credits' ); ?></a>
			<a href="freedoms.php" class="nav-tab"><?php _e( 'Freedoms' ); ?></a>
		</h2>

		<div class="headline-feature feature-video">
			<iframe width="1050" height="591" src="<?php echo esc_url( $video_url ); ?>" frameborder="0" allowfullscreen></iframe>
			<script src="https://videopress.com/videopress-iframe.js"></script>
		</div>

		<hr/>

		<div class="feature-section two-col">
			<?php foreach ( $major_features as $feature ) : ?>
			<div class="col">
				<div class="media-container">
					<?php
					// Video.
					if ( is_array( $feature['src'] ) ) :
						echo wp_video_shortcode( array(
							'mp4'      => $feature['src']['mp4'],
							'ogv'      => $feature['src']['ogv'],
							'webm'     => $feature['src']['webm'],
							'loop'     => true,
							'autoplay' => true,
							'width'    => 500,
							'height'   => 284
						) );

					// Image.
					else:
					?>
					<img src="<?php echo esc_url( $feature['src'] ); ?>" alt="" />
					<?php endif; ?>
				</div>
				<h3><?php echo $feature['heading']; ?></h3>
				<p><?php echo $feature['description']; ?></p>
			</div>
			<?php endforeach; ?>
		</div>

		<div class="feature-section three-col">
			<?php foreach ( $minor_features as $feature ) : ?>
			<div class="col">
				<div class="svg-container">
					<img src="<?php echo esc_attr( $feature['src'] ); ?>" alt="" />
				</div>
				<h3><?php echo $feature['heading']; ?></h3>
				<p><?php echo $feature['description']; ?></p>
			</div>
			<?php endforeach; ?>
		</div>

		<div class="changelog">
			<h3><?php _e( 'Under the Hood' ); ?></h3>

			<div class="feature-section under-the-hood three-col">
				<?php foreach ( $tech_features as $feature ) : ?>
				<div class="col">
					<h4><?php echo $feature['heading']; ?></h4>
					<p><?php echo $feature['description']; ?></p>
				</div>
				<?php endforeach; ?>
			</div>

			<div class="return-to-dashboard">
				<?php if ( current_user_can( 'update_core' ) && isset( $_GET['updated'] ) ) : ?>
					<a href="<?php echo esc_url( self_admin_url( 'update-core.php' ) ); ?>">
						<?php is_multisite() ? _e( 'Return to Updates' ) : _e( 'Return to Dashboard &rarr; Updates' ); ?>
					</a> |
				<?php endif; ?>
				<a href="<?php echo esc_url( self_admin_url() ); ?>"><?php is_blog_admin() ? _e( 'Go to Dashboard &rarr; Home' ) : _e( 'Go to Dashboard' ); ?></a>
			</div>

		</div>
	</div>
<?php

include( ABSPATH . 'wp-admin/admin-footer.php' );

// These are strings we may use to describe maintenance/security releases, where we aim for no new strings.
return;

__( 'Maintenance Release' );
__( 'Maintenance Releases' );

__( 'Security Release' );
__( 'Security Releases' );

__( 'Maintenance and Security Release' );
__( 'Maintenance and Security Releases' );

/* translators: %s: WordPress version number */
__( '<strong>Version %s</strong> addressed one security issue.' );
/* translators: %s: WordPress version number */
__( '<strong>Version %s</strong> addressed some security issues.' );

/* translators: 1: WordPress version number, 2: plural number of bugs. */
_n_noop( '<strong>Version %1$s</strong> addressed %2$s bug.',
         '<strong>Version %1$s</strong> addressed %2$s bugs.' );

/* translators: 1: WordPress version number, 2: plural number of bugs. Singular security issue. */
_n_noop( '<strong>Version %1$s</strong> addressed a security issue and fixed %2$s bug.',
         '<strong>Version %1$s</strong> addressed a security issue and fixed %2$s bugs.' );

/* translators: 1: WordPress version number, 2: plural number of bugs. More than one security issue. */
_n_noop( '<strong>Version %1$s</strong> addressed some security issues and fixed %2$s bug.',
         '<strong>Version %1$s</strong> addressed some security issues and fixed %2$s bugs.' );

/* translators: %s: Codex URL */
__( 'For more information, see <a href="%s">the release notes</a>.' );