WordPress/wp-admin/about.php

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

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

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

/**
 * Replaces the height and width attributes with values for full size.
 *
 * wp_video_shortcode() limits the width to 640px.
 *
 * @since 4.6.0
 * @ignore
 *
 * @param $output Video shortcode HTML output.
 * @return string Filtered HTML content to display video.
 */
function _wp_override_admin_video_width_limit( $output ) {
	return str_replace( array( '640', '384' ), array( '1050', '630' ), $output );
}

$video_url = 'https://videopress.com/embed/GbdhpGF3?hd=true';
$lang_code = str_replace( '_', '-', get_user_locale() );
list( $lang_code ) = explode( '-', $lang_code );
if ( 'en' !== $lang_code ) {
	$video_url = add_query_arg( 'defaultLangCode', $lang_code, $video_url );
}

$title = __( 'About' );

list( $display_version ) = explode( '-', get_bloginfo( 'version' ) );

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

		<p class="about-text"><?php printf( __( 'Thank you for updating to the latest version! WordPress %s helps you get your site set up the way you want it.' ), $display_version ); ?></p>
		<div class="wp-badge"><?php printf( __( 'Version %s' ), $display_version ); ?></div>

		<h2 class="nav-tab-wrapper wp-clearfix">
			<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="twenty-seventeen feature-section one-col">
			<h2><?php _e( 'Presenting Twenty Seventeen' ); ?></h2>
			<p><?php _e( 'A brand new default theme brings your site to life with immersive featured images and video headers.' ); ?></p>
			<p><?php _e( 'Twenty Seventeen focuses on business sites and features a customizable front page with multiple sections. Personalize it with widgets, navigation, social menus, a logo, custom colors, and more. Our default theme for 2017 works great in many languages, on any device, and for a wide range of users.' ); ?></p>
		</div>

		<hr />

		<div class="site-customization feature-section one-col">
			<h2><?php _e( 'Your Site, Your Way' ); ?></h2>
			<p><?php _e( 'WordPress 4.7 adds new features to the customizer to help take you through the initial setup of a theme, with non-destructive live previews of all your changes in one uninterrupted workflow.' ); ?></p>

			<h3><?php _e( 'Theme Starter Content' ); ?></h2>
			<p><?php _e( 'To help give you a solid base to build from, individual themes can provide starter content that appears when you go to customize your brand new site. This can range from placing a business information widget in the best location to providing a sample menu with social icon links to a static front page complete with beautiful images. Don&#8217;t worry - nothing new will appear on the live site until you&#8217;re ready to save and publish your initial theme setup.' ); ?></p>
		</div>

		<div class="feature-section two-col">
			<div class="col">
				<h3><?php _e( 'Edit Shortcuts' ); ?></h3>
				<p><?php _e( 'Visible icons appear to show you which parts of your site can be customized while live previewing. Click on a shortcut and get straight to editing. Paired with starter content, getting started with customizing your site is faster than ever.' );?></p>
			</div>
			<div class="col">
				<h3><?php _e( 'Video Headers' ); ?></h3>
				<p><?php _e( 'Sometimes a big atmospheric video as a moving header image is just what you need to showcase your wares; go ahead and try it out with Twenty Seventeen. Need some video inspiration? Try searching for sites with video headers available for download and use.' ); ?></p>
			</div>
		</div>

		<div class="feature-section two-col">
			<div class="col">
				<h3><?php _e( 'Smoother Menu Building' ); ?></h3>
				<p><?php _e( 'Many menus for sites contain links to the pages of your site, but what happens when you don&#8217;t have any pages yet? Now you can add new pages while building menus instead of leaving the customizer and abandoning your changes. Once you&#8217;ve published your customizations, you&#8217;ll have new pages ready for you to fill with content.' );?></p>
			</div>
			<div class="col">
				<h3><?php _e( 'Custom CSS' ); ?></h3>
				<p><?php _e( 'Sometimes you just need a few visual tweaks to make your site perfect. WordPress 4.7 allows you to add custom CSS and instantly see how your changes affect your site. The live preview allows you to work quickly without page refreshes slowing you down.' ); ?></p>
			</div>
		</div>

		<hr />

		<div class="feature-section two-col">
			<div class="col">
				<h3><?php _e( 'PDF Thumbnail Previews' ); ?></h3>
				<p><?php _e( 'Managing your document collection is easier with WordPress 4.7. Uploading PDFs will generate thumbnail images so you can more easily distinguish between all your documents.' ); ?></p>
			</div>
			<div class="col">
				<h3><?php _e( 'Dashboard in your language' ); ?></h3>
				<p><?php _e( 'Just because your site is in one language doesn&#8217;t mean that everybody helping manage it prefers that language for their admin. Add more languages to your site and a user language option will show up in your user&#8217;s profiles.' );?></p>
			</div>
		</div>

		<hr />

		<div class="rest-api feature-section one-col">
			<h2><?php _e( 'Introducing REST API Content Endpoints' ); ?></h2>
			<p><?php _e( 'WordPress 4.7 comes with REST API endpoints for posts, comments, terms, users, meta, and settings.' ); ?></p>
			<p><?php
				printf(
					/* translators: %s: https://developer.wordpress.org/rest-api/  */
					__( 'Content endpoints provide machine-readable external access to your WordPress site with a clear, standards-driven interface, paving the way for new and innovative methods of interacting with sites through plugins, themes, apps, and beyond. Ready to get started with development? <a href="%s">Check out the REST API reference.</a>' ),
					'https://developer.wordpress.org/rest-api/'
				);
			?></p>
		</div>

		<hr />

		<div class="changelog">
			<h2><?php _e( 'Even More Developer Happiness 😊' ); ?></h2>

			<div class="under-the-hood three-col">
				<div class="col">
					<h3><?php
						printf(
							/* translators: %s: https://make.wordpress.org/core/2016/11/03/post-type-templates-in-4-7/  */
							__( '<a href="%s">Post Type Templates</a>' ),
							'https://make.wordpress.org/core/2016/11/03/post-type-templates-in-4-7/'
						);
					?></h3>
					<p><?php _e( 'By opening up the page template functionality to all post types, theme developers have even more flexibility with the WordPress template hierarchy.' ); ?></p>
				</div>
				<div class="col">
					<h3><?php _e( 'More Theme API Goodies' ); ?></h3>
					<p><?php
						printf(
							/* translators: %s: https://make.wordpress.org/core/2016/09/09/new-functions-hooks-and-behaviour-for-theme-developers-in-wordpress-4-7/  */
							__( 'WordPress 4.7 includes <a href="%s">new functions, hooks, and behavior</a> for theme developers.' ),
							'https://make.wordpress.org/core/2016/09/09/new-functions-hooks-and-behaviour-for-theme-developers-in-wordpress-4-7/'
						);
					?></p>
				</div>
				<div class="col">
					<h3><?php
						printf(
							/* translators: %s: https://make.wordpress.org/core/2016/10/04/custom-bulk-actions/  */
							__( '<a href="%s">Custom Bulk Actions</a>' ),
							'https://make.wordpress.org/core/2016/10/04/custom-bulk-actions/'
						);
					?></h3>
					<p><?php _e( 'List tables, now with more than bulk edit and delete.' ); ?></p>
				</div>
			</div>

			<div class="under-the-hood three-col">
				<div class="col">
					<h3><?php
						printf(
							'<a href="%1$s">%2$s</a>',
							'https://make.wordpress.org/core/2016/09/08/wp_hook-next-generation-actions-and-filters/',
							'<code>WP_Hook</code>'
						);
					?></h3>
					<p><?php
						printf(
							/* translators: %s: https://make.wordpress.org/core/2016/09/08/wp_hook-next-generation-actions-and-filters/  */
							__( 'The code that lies beneath actions and filters has been overhauled and modernized, fixing bugs along the way.' ),
							'https://make.wordpress.org/core/2016/09/08/wp_hook-next-generation-actions-and-filters/'
						);
					?></p>
				</div>
				<div class="col">
					<h3><?php _e( 'Settings Registration API' ); ?></h3>
					<p><?php
						printf(
							/* translators: 1: register_setting(), 2: https://make.wordpress.org/core/2016/10/26/registering-your-settings-in-wordpress-4-7/ */
							__( '%1$s <a href="%2$s">has been enhanced</a> to include type, description, and REST API visibility.' ),
							'<code>register_setting()</code>',
							'https://make.wordpress.org/core/2016/10/26/registering-your-settings-in-wordpress-4-7/'
						);
					?></p>
				</div>
				<div class="col">
					<h3><?php
						printf(
							/* translators: %s: https://make.wordpress.org/core/2016/10/12/customize-changesets-technical-design-decisions/  */
							__( '<a href="%s">Customize Changesets</a>' ),
							'https://make.wordpress.org/core/2016/10/12/customize-changesets-technical-design-decisions/'
						);
					?></h3>
					<p><?php _e( 'Customize changesets make changes in the customizer persistent, like autosave drafts. They also make exciting new features like starter content possible.' ); ?></p>
				</div>
			</div>

		</div>

		<hr />

		<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>
<?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>.' );