X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/41578db67d72562346e4dbb2a14889b23d522813..607b7e02d77e7326161e8ec15639052d2040f745:/wp-admin/update-core.php

diff --git a/wp-admin/update-core.php b/wp-admin/update-core.php
index a8a7aa99..404bb8ac 100644
--- a/wp-admin/update-core.php
+++ b/wp-admin/update-core.php
@@ -20,8 +20,18 @@ if ( is_multisite() && ! is_network_admin() ) {
 }
 
 if ( ! current_user_can( 'update_core' ) && ! current_user_can( 'update_themes' ) && ! current_user_can( 'update_plugins' ) )
-	wp_die( __( 'You do not have sufficient permissions to update this site.' ) );
+	wp_die( __( 'Sorry, you are not allowed to update this site.' ) );
 
+/**
+ *
+ * @global string $wp_local_package
+ * @global wpdb   $wpdb
+ * @global string $wp_version
+ *
+ * @staticvar bool $first_pass
+ *
+ * @param object $update
+ */
 function list_core_update( $update ) {
  	global $wp_local_package, $wpdb, $wp_version;
   	static $first_pass = true;
@@ -58,13 +68,13 @@ function list_core_update( $update ) {
 				$mysql_compat = version_compare( $mysql_version, $update->mysql_version, '>=' );
 
 			if ( !$mysql_compat && !$php_compat )
-				$message = sprintf( __('You cannot update because <a href="http://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> requires PHP version %2$s or higher and MySQL version %3$s or higher. You are running PHP version %4$s and MySQL version %5$s.'), $update->current, $update->php_version, $update->mysql_version, $php_version, $mysql_version );
+				$message = sprintf( __('You cannot update because <a href="https://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> requires PHP version %2$s or higher and MySQL version %3$s or higher. You are running PHP version %4$s and MySQL version %5$s.'), $update->current, $update->php_version, $update->mysql_version, $php_version, $mysql_version );
 			elseif ( !$php_compat )
-				$message = sprintf( __('You cannot update because <a href="http://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> requires PHP version %2$s or higher. You are running version %3$s.'), $update->current, $update->php_version, $php_version );
+				$message = sprintf( __('You cannot update because <a href="https://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> requires PHP version %2$s or higher. You are running version %3$s.'), $update->current, $update->php_version, $php_version );
 			elseif ( !$mysql_compat )
-				$message = sprintf( __('You cannot update because <a href="http://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> requires MySQL version %2$s or higher. You are running version %3$s.'), $update->current, $update->mysql_version, $mysql_version );
+				$message = sprintf( __('You cannot update because <a href="https://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> requires MySQL version %2$s or higher. You are running version %3$s.'), $update->current, $update->mysql_version, $mysql_version );
 			else
-				$message = 	sprintf(__('You can update to <a href="http://codex.wordpress.org/Version_%1$s">WordPress %2$s</a> automatically or download the package and install it manually:'), $update->current, $version_string);
+				$message = 	sprintf(__('You can update to <a href="https://codex.wordpress.org/Version_%1$s">WordPress %2$s</a> automatically or download the package and install it manually:'), $update->current, $version_string);
 			if ( !$mysql_compat || !$php_compat )
 				$show_buttons = false;
 		}
@@ -104,6 +114,9 @@ function list_core_update( $update ) {
 
 }
 
+/**
+ * @since 2.7.0
+ */
 function dismissed_updates() {
 	$dismissed = get_core_updates( array( 'dismissed' => true, 'available' => false ) );
 	if ( $dismissed ) {
@@ -122,7 +135,7 @@ function dismissed_updates() {
 	<?php
 		echo '<p class="hide-if-no-js"><a id="show-dismissed" href="#">'.__('Show hidden updates').'</a></p>';
 		echo '<ul id="dismissed-updates" class="core-updates dismissed">';
-		foreach( (array) $dismissed as $update) {
+		foreach ( (array) $dismissed as $update) {
 			echo '<li>';
 			list_core_update( $update );
 			echo '</li>';
@@ -136,7 +149,9 @@ function dismissed_updates() {
  *
  * @since 2.7.0
  *
- * @return null
+ * @global string $wp_version
+ * @global string $required_php_version
+ * @global string $required_mysql_version
  */
 function core_upgrade_preamble() {
 	global $wp_version, $required_php_version, $required_mysql_version;
@@ -144,7 +159,7 @@ function core_upgrade_preamble() {
 	$updates = get_core_updates();
 
 	if ( !isset($updates[0]->response) || 'latest' == $updates[0]->response ) {
-		echo '<h3>';
+		echo '<h2>';
 		_e('You have the latest version of WordPress.');
 
 		if ( wp_http_supports( array( 'ssl' ) ) ) {
@@ -160,27 +175,29 @@ function core_upgrade_preamble() {
 			if ( $should_auto_update )
 				echo ' ' . __( 'Future security updates will be applied automatically.' );
 		}
-		echo '</h3>';
+		echo '</h2>';
 	} else {
-		echo '<div class="updated inline"><p>';
-		_e('<strong>Important:</strong> before updating, please <a href="http://codex.wordpress.org/WordPress_Backups">back up your database and files</a>. For help with updates, visit the <a href="http://codex.wordpress.org/Updating_WordPress">Updating WordPress</a> Codex page.');
+		echo '<div class="notice notice-warning"><p>';
+		_e('<strong>Important:</strong> before updating, please <a href="https://codex.wordpress.org/WordPress_Backups">back up your database and files</a>. For help with updates, visit the <a href="https://codex.wordpress.org/Updating_WordPress">Updating WordPress</a> Codex page.');
 		echo '</p></div>';
 
-		echo '<h3 class="response">';
+		echo '<h2 class="response">';
 		_e( 'An updated version of WordPress is available.' );
-		echo '</h3>';
+		echo '</h2>';
 	}
 
 	if ( isset( $updates[0] ) && $updates[0]->response == 'development' ) {
 		require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
 		$upgrader = new WP_Automatic_Updater;
-		if ( wp_http_supports( 'ssl' ) && $upgrader->should_update( 'core', $updates[0], ABSPATH ) )
-			echo '<div class="updated inline"><p><strong>BETA TESTERS:</strong> This site is set up to install updates of future beta versions automatically.</p></div>';
+		if ( wp_http_supports( 'ssl' ) && $upgrader->should_update( 'core', $updates[0], ABSPATH ) ) {
+			echo '<div class="updated inline"><p>';
+			echo '<strong>' . __( 'BETA TESTERS:' ) . '</strong> ' . __( 'This site is set up to install updates of future beta versions automatically.' );
+			echo '</p></div>';
+		}
 	}
 
 	echo '<ul class="core-updates">';
-	$alternate = true;
-	foreach( (array) $updates as $update ) {
+	foreach ( (array) $updates as $update ) {
 		echo '<li>';
 		list_core_update( $update );
 		echo '</li>';
@@ -196,6 +213,10 @@ function core_upgrade_preamble() {
 	dismissed_updates();
 }
 
+/**
+ *
+ * @global string $wp_version
+ */
 function list_plugin_updates() {
 	global $wp_version;
 
@@ -204,7 +225,7 @@ function list_plugin_updates() {
 	require_once(ABSPATH . 'wp-admin/includes/plugin-install.php');
 	$plugins = get_plugin_updates();
 	if ( empty( $plugins ) ) {
-		echo '<h3>' . __( 'Plugins' ) . '</h3>';
+		echo '<h2>' . __( 'Plugins' ) . '</h2>';
 		echo '<p>' . __( 'Your plugins are all up to date.' ) . '</p>';
 		return;
 	}
@@ -216,43 +237,38 @@ function list_plugin_updates() {
 	else
 		$core_update_version = $core_updates[0]->current;
 	?>
-<h3><?php _e( 'Plugins' ); ?></h3>
+<h2><?php _e( 'Plugins' ); ?></h2>
 <p><?php _e( 'The following plugins have new versions available. Check the ones you want to update and then click &#8220;Update Plugins&#8221;.' ); ?></p>
 <form method="post" action="<?php echo esc_url( $form_action ); ?>" name="upgrade-plugins" class="upgrade">
 <?php wp_nonce_field('upgrade-core'); ?>
 <p><input id="upgrade-plugins" class="button" type="submit" value="<?php esc_attr_e('Update Plugins'); ?>" name="upgrade" /></p>
-<table class="widefat" id="update-plugins-table">
+<table class="widefat updates-table" id="update-plugins-table">
 	<thead>
 	<tr>
-		<th scope="col" class="manage-column check-column"><input type="checkbox" id="plugins-select-all" /></th>
-		<th scope="col" class="manage-column"><label for="plugins-select-all"><?php _e('Select All'); ?></label></th>
+		<td class="manage-column check-column"><input type="checkbox" id="plugins-select-all" /></td>
+		<td class="manage-column"><label for="plugins-select-all"><?php _e( 'Select All' ); ?></label></td>
 	</tr>
 	</thead>
 
-	<tfoot>
-	<tr>
-		<th scope="col" class="manage-column check-column"><input type="checkbox" id="plugins-select-all-2" /></th>
-		<th scope="col" class="manage-column"><label for="plugins-select-all-2"><?php _e('Select All'); ?></label></th>
-	</tr>
-	</tfoot>
 	<tbody class="plugins">
 <?php
-	foreach ( (array) $plugins as $plugin_file => $plugin_data) {
-		$info = plugins_api('plugin_information', array('slug' => $plugin_data->update->slug ));
+	foreach ( (array) $plugins as $plugin_file => $plugin_data ) {
 		// Get plugin compat for running version of WordPress.
-		if ( isset($info->tested) && version_compare($info->tested, $cur_wp_version, '>=') ) {
+		if ( isset($plugin_data->update->tested) && version_compare($plugin_data->update->tested, $cur_wp_version, '>=') ) {
 			$compat = '<br />' . sprintf(__('Compatibility with WordPress %1$s: 100%% (according to its author)'), $cur_wp_version);
-		} elseif ( isset($info->compatibility[$cur_wp_version][$plugin_data->update->new_version]) ) {
-			$compat = $info->compatibility[$cur_wp_version][$plugin_data->update->new_version];
-			$compat = '<br />' . sprintf(__('Compatibility with WordPress %1$s: %2$d%% (%3$d "works" votes out of %4$d total)'), $cur_wp_version, $compat[0], $compat[2], $compat[1]);
+		} elseif ( isset($plugin_data->update->compatibility->{$cur_wp_version}) ) {
+			$compat = $plugin_data->update->compatibility->{$cur_wp_version};
+			$compat = '<br />' . sprintf(__('Compatibility with WordPress %1$s: %2$d%% (%3$d "works" votes out of %4$d total)'), $cur_wp_version, $compat->percent, $compat->votes, $compat->total_votes);
 		} else {
 			$compat = '<br />' . sprintf(__('Compatibility with WordPress %1$s: Unknown'), $cur_wp_version);
 		}
 		// Get plugin compat for updated version of WordPress.
 		if ( $core_update_version ) {
-			if ( isset($info->compatibility[$core_update_version][$plugin_data->update->new_version]) ) {
-				$update_compat = $info->compatibility[$core_update_version][$plugin_data->update->new_version];
-				$compat .= '<br />' . sprintf(__('Compatibility with WordPress %1$s: %2$d%% (%3$d "works" votes out of %4$d total)'), $core_update_version, $update_compat[0], $update_compat[2], $update_compat[1]);
+			if ( isset( $plugin_data->update->tested ) && version_compare( $plugin_data->update->tested, $core_update_version, '>=' ) ) {
+				$compat .= '<br />' . sprintf( __( 'Compatibility with WordPress %1$s: 100%% (according to its author)' ), $core_update_version );
+			} elseif ( isset( $plugin_data->update->compatibility->{$core_update_version} ) ) {
+				$update_compat = $plugin_data->update->compatibility->{$core_update_version};
+				$compat .= '<br />' . sprintf(__('Compatibility with WordPress %1$s: %2$d%% (%3$d "works" votes out of %4$d total)'), $core_update_version, $update_compat->percent, $update_compat->votes, $update_compat->total_votes);
 			} else {
 				$compat .= '<br />' . sprintf(__('Compatibility with WordPress %1$s: Unknown'), $core_update_version);
 			}
@@ -265,76 +281,135 @@ function list_plugin_updates() {
 		}
 
 		$details_url = self_admin_url('plugin-install.php?tab=plugin-information&plugin=' . $plugin_data->update->slug . '&section=changelog&TB_iframe=true&width=640&height=662');
-		$details_text = sprintf(__('View version %1$s details'), $plugin_data->update->new_version);
-		$details = sprintf('<a href="%1$s" class="thickbox" title="%2$s">%3$s</a>.', esc_url($details_url), esc_attr($plugin_data->Name), $details_text);
-
-		echo "
-	<tr>
-		<th scope='row' class='check-column'><input type='checkbox' name='checked[]' value='" . esc_attr($plugin_file) . "' /></th>
-		<td><p><strong>{$plugin_data->Name}</strong><br />" . sprintf(__('You have version %1$s installed. Update to %2$s.'), $plugin_data->Version, $plugin_data->update->new_version) . ' ' . $details . $compat . $upgrade_notice . "</p></td>
-	</tr>";
+		$details = sprintf(
+			'<a href="%1$s" class="thickbox open-plugin-details-modal" aria-label="%2$s">%3$s</a>',
+			esc_url( $details_url ),
+			/* translators: 1: plugin name, 2: version number */
+			esc_attr( sprintf( __( 'View %1$s version %2$s details' ), $plugin_data->Name, $plugin_data->update->new_version ) ),
+			/* translators: %s: plugin version */
+			sprintf( __( 'View version %s details.' ), $plugin_data->update->new_version )
+		);
+
+		$checkbox_id = "checkbox_" . md5( $plugin_data->Name );
+		?>
+		<tr>
+			<td class="check-column">
+				<input type="checkbox" name="checked[]" id="<?php echo $checkbox_id; ?>" value="<?php echo esc_attr( $plugin_file ); ?>" />
+				<label for="<?php echo $checkbox_id; ?>" class="screen-reader-text"><?php
+					/* translators: %s: plugin name */
+					printf( __( 'Select %s' ),
+						$plugin_data->Name
+					);
+				?></label>
+			</td>
+			<td class="plugin-title"><p>
+				<strong><?php echo $plugin_data->Name; ?></strong>
+				<?php
+					/* translators: 1: plugin version, 2: new version */
+					printf( __( 'You have version %1$s installed. Update to %2$s.' ),
+						$plugin_data->Version,
+						$plugin_data->update->new_version
+					);
+					echo ' ' . $details . $compat . $upgrade_notice;
+				?>
+			</p></td>
+		</tr>
+		<?php
 	}
 ?>
 	</tbody>
+
+	<tfoot>
+	<tr>
+		<td class="manage-column check-column"><input type="checkbox" id="plugins-select-all-2" /></td>
+		<td class="manage-column"><label for="plugins-select-all-2"><?php _e( 'Select All' ); ?></label></td>
+	</tr>
+	</tfoot>
 </table>
 <p><input id="upgrade-plugins-2" class="button" type="submit" value="<?php esc_attr_e('Update Plugins'); ?>" name="upgrade" /></p>
 </form>
 <?php
 }
 
+/**
+ * @since 2.9.0
+ */
 function list_theme_updates() {
 	$themes = get_theme_updates();
 	if ( empty( $themes ) ) {
-		echo '<h3>' . __( 'Themes' ) . '</h3>';
+		echo '<h2>' . __( 'Themes' ) . '</h2>';
 		echo '<p>' . __( 'Your themes are all up to date.' ) . '</p>';
 		return;
 	}
 
 	$form_action = 'update-core.php?action=do-theme-upgrade';
-
 ?>
-<h3><?php _e( 'Themes' ); ?></h3>
+<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.' ), __( 'http://codex.wordpress.org/Child_Themes' ) ); ?></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" id="update-themes-table">
+<table class="widefat updates-table" id="update-themes-table">
 	<thead>
 	<tr>
-		<th scope="col" class="manage-column check-column"><input type="checkbox" id="themes-select-all" /></th>
-		<th scope="col" class="manage-column"><label for="themes-select-all"><?php _e('Select All'); ?></label></th>
+		<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>
 
-	<tfoot>
-	<tr>
-		<th scope="col" class="manage-column check-column"><input type="checkbox" id="themes-select-all-2" /></th>
-		<th scope="col" class="manage-column"><label for="themes-select-all-2"><?php _e('Select All'); ?></label></th>
-	</tr>
-	</tfoot>
 	<tbody class="plugins">
 <?php
 	foreach ( $themes as $stylesheet => $theme ) {
-		echo "
-	<tr>
-		<th scope='row' class='check-column'><input type='checkbox' name='checked[]' value='" . esc_attr( $stylesheet ) . "' /></th>
-		<td class='plugin-title'><img src='" . esc_url( $theme->get_screenshot() ) . "' width='85' height='64' style='float:left; padding: 0 5px 5px' /><strong>" . $theme->display('Name') . '</strong> ' . sprintf( __( 'You have version %1$s installed. Update to %2$s.' ), $theme->display('Version'), $theme->update['new_version'] ) . "</td>
-	</tr>";
+		$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
 }
 
+/**
+ * @since 3.7.0
+ */
 function list_translation_updates() {
 	$updates = wp_get_translation_updates();
 	if ( ! $updates ) {
 		if ( 'en_US' != get_locale() ) {
-			echo '<h3>' . __( 'Translations' ) . '</h3>';
+			echo '<h2>' . __( 'Translations' ) . '</h2>';
 			echo '<p>' . __( 'Your translations are all up to date.' ) . '</p>';
 		}
 		return;
@@ -342,10 +417,10 @@ function list_translation_updates() {
 
 	$form_action = 'update-core.php?action=do-translation-upgrade';
 	?>
-	<h3><?php _e( 'Translations' ); ?></h3>
-	<form method="post" action="<?php echo esc_url( $form_action ); ?>" name="upgrade-themes" class="upgrade">
-		<p><?php _e( 'Some of your translations are out of date.' ); ?></p>
-		<?php wp_nonce_field('upgrade-translations'); ?>
+	<h2><?php _e( 'Translations' ); ?></h2>
+	<form method="post" action="<?php echo esc_url( $form_action ); ?>" name="upgrade-translations" class="upgrade">
+		<p><?php _e( 'New translations are available.' ); ?></p>
+		<?php wp_nonce_field( 'upgrade-translations' ); ?>
 		<p><input class="button" type="submit" value="<?php esc_attr_e( 'Update Translations' ); ?>" name="upgrade" /></p>
 	</form>
 	<?php
@@ -356,12 +431,14 @@ function list_translation_updates() {
  *
  * @since 2.7.0
  *
- * @return null
+ * @global WP_Filesystem_Base $wp_filesystem Subclass
+ *
+ * @param bool $reinstall
  */
 function do_core_upgrade( $reinstall = false ) {
 	global $wp_filesystem;
 
-	include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
+	include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
 
 	if ( $reinstall )
 		$url = 'update-core.php?action=do-core-reinstall';
@@ -375,19 +452,23 @@ function do_core_upgrade( $reinstall = false ) {
 	if ( !$update )
 		return;
 
+	// Allow relaxed file ownership writes for User-initiated upgrades when the API specifies
+	// that it's safe to do so. This only happens when there are no new files to create.
+	$allow_relaxed_file_ownership = ! $reinstall && isset( $update->new_files ) && ! $update->new_files;
+
 ?>
 	<div class="wrap">
-	<h2><?php _e('Update WordPress'); ?></h2>
+	<h1><?php _e( 'Update WordPress' ); ?></h1>
 <?php
 
-	if ( false === ( $credentials = request_filesystem_credentials( $url, '', false, ABSPATH ) ) ) {
+	if ( false === ( $credentials = request_filesystem_credentials( $url, '', false, ABSPATH, array( 'version', 'locale' ), $allow_relaxed_file_ownership ) ) ) {
 		echo '</div>';
 		return;
 	}
 
-	if ( ! WP_Filesystem( $credentials, ABSPATH ) ) {
+	if ( ! WP_Filesystem( $credentials, ABSPATH, $allow_relaxed_file_ownership ) ) {
 		// Failed to connect, Error and request again
-		request_filesystem_credentials( $url, '', true, ABSPATH );
+		request_filesystem_credentials( $url, '', true, ABSPATH, array( 'version', 'locale' ), $allow_relaxed_file_ownership );
 		echo '</div>';
 		return;
 	}
@@ -405,11 +486,13 @@ function do_core_upgrade( $reinstall = false ) {
 	add_filter( 'update_feedback', 'show_message' );
 
 	$upgrader = new Core_Upgrader();
-	$result = $upgrader->upgrade( $update );
+	$result = $upgrader->upgrade( $update, array(
+		'allow_relaxed_file_ownership' => $allow_relaxed_file_ownership
+	) );
 
 	if ( is_wp_error($result) ) {
 		show_message($result);
-		if ('up_to_date' != $result->get_error_code() )
+		if ( 'up_to_date' != $result->get_error_code() && 'locked' != $result->get_error_code() )
 			show_message( __('Installation Failed') );
 		echo '</div>';
 		return;
@@ -426,6 +509,9 @@ function do_core_upgrade( $reinstall = false ) {
 	<?php
 }
 
+/**
+ * @since 2.7.0
+ */
 function do_dismiss_core_update() {
 	$version = isset( $_POST['version'] )? $_POST['version'] : false;
 	$locale = isset( $_POST['locale'] )? $_POST['locale'] : 'en_US';
@@ -437,6 +523,9 @@ function do_dismiss_core_update() {
 	exit;
 }
 
+/**
+ * @since 2.7.0
+ */
 function do_undismiss_core_update() {
 	$version = isset( $_POST['version'] )? $_POST['version'] : false;
 	$locale = isset( $_POST['locale'] )? $_POST['locale'] : 'en_US';
@@ -460,7 +549,7 @@ if ( ( 'do-theme-upgrade' == $action || ( 'do-plugin-upgrade' == $action && ! is
 $title = __('WordPress Updates');
 $parent_file = 'index.php';
 
-$updates_overview  = '<p>' . __( 'On this screen, you can update to the latest version of WordPress, as well as update your themes and plugins from the WordPress.org repositories.' ) . '</p>';
+$updates_overview  = '<p>' . __( 'On this screen, you can update to the latest version of WordPress, as well as update your themes, plugins, and translations from the WordPress.org repositories.' ) . '</p>';
 $updates_overview .= '<p>' . __( 'If an update is available, you&#8127;ll see a notification appear in the Toolbar and navigation menu.' ) . ' ' . __( 'Keeping your site updated is important for security. It also makes the internet a safer place for you and your readers.' ) . '</p>';
 
 get_current_screen()->add_help_tab( array(
@@ -484,7 +573,7 @@ get_current_screen()->add_help_tab( array(
 
 get_current_screen()->set_help_sidebar(
 	'<p><strong>' . __('For more information:') . '</strong></p>' .
-	'<p>' . __( '<a href="http://codex.wordpress.org/Dashboard_Updates_Screen" target="_blank">Documentation on Updating WordPress</a>' ) . '</p>' .
+	'<p>' . __( '<a href="https://codex.wordpress.org/Dashboard_Updates_Screen" target="_blank">Documentation on Updating WordPress</a>' ) . '</p>' .
 	'<p>' . __( '<a href="https://wordpress.org/support/" target="_blank">Support Forums</a>' ) . '</p>'
 );
 
@@ -496,7 +585,7 @@ if ( 'upgrade-core' == $action ) {
 	require_once(ABSPATH . 'wp-admin/admin-header.php');
 	?>
 	<div class="wrap">
-	<h2><?php _e('WordPress Updates'); ?></h2>
+	<h1><?php _e( 'WordPress Updates' ); ?></h1>
 	<?php
 	if ( $upgrade_error ) {
 		echo '<div class="error"><p>';
@@ -509,7 +598,7 @@ if ( 'upgrade-core' == $action ) {
 
 	echo '<p>';
 	/* translators: %1 date, %2 time. */
-	printf( __('Last checked on %1$s at %2$s.'), date_i18n( get_option( 'date_format' ) ), date_i18n( get_option( 'time_format' ) ) );
+	printf( __( 'Last checked on %1$s at %2$s.' ), date_i18n( __( 'F j, Y' ) ), date_i18n( __( 'g:i a' ) ) );
 	echo ' &nbsp; <a class="button" href="' . esc_url( self_admin_url('update-core.php?force-check=1') ) . '">' . __( 'Check Again' ) . '</a>';
 	echo '</p>';
 
@@ -534,12 +623,11 @@ if ( 'upgrade-core' == $action ) {
 } elseif ( 'do-core-upgrade' == $action || 'do-core-reinstall' == $action ) {
 
 	if ( ! current_user_can( 'update_core' ) )
-		wp_die( __( 'You do not have sufficient permissions to update this site.' ) );
+		wp_die( __( 'Sorry, you are not allowed to update this site.' ) );
 
 	check_admin_referer('upgrade-core');
 
-	// do the (un)dismiss actions before headers,
-	// so that they can redirect
+	// Do the (un)dismiss actions before headers, so that they can redirect.
 	if ( isset( $_POST['dismiss'] ) )
 		do_dismiss_core_update();
 	elseif ( isset( $_POST['undismiss'] ) )
@@ -559,7 +647,7 @@ if ( 'upgrade-core' == $action ) {
 } elseif ( 'do-plugin-upgrade' == $action ) {
 
 	if ( ! current_user_can( 'update_plugins' ) )
-		wp_die( __( 'You do not have sufficient permissions to update this site.' ) );
+		wp_die( __( 'Sorry, you are not allowed to update this site.' ) );
 
 	check_admin_referer('upgrade-core');
 
@@ -579,15 +667,15 @@ if ( 'upgrade-core' == $action ) {
 
 	require_once(ABSPATH . 'wp-admin/admin-header.php');
 	echo '<div class="wrap">';
-	echo '<h2>' . esc_html__('Update Plugins') . '</h2>';
-	echo "<iframe src='$url' style='width: 100%; height: 100%; min-height: 750px;' frameborder='0'></iframe>";
+	echo '<h1>' . __( 'Update Plugins' ) . '</h1>';
+	echo '<iframe src="', $url, '" style="width: 100%; height: 100%; min-height: 750px;" frameborder="0" title="' . esc_attr__( 'Update progress' ) . '"></iframe>';
 	echo '</div>';
 	include(ABSPATH . 'wp-admin/admin-footer.php');
 
 } elseif ( 'do-theme-upgrade' == $action ) {
 
 	if ( ! current_user_can( 'update_themes' ) )
-		wp_die( __( 'You do not have sufficient permissions to update this site.' ) );
+		wp_die( __( 'Sorry, you are not allowed to update this site.' ) );
 
 	check_admin_referer('upgrade-core');
 
@@ -606,16 +694,18 @@ if ( 'upgrade-core' == $action ) {
 	$title = __('Update Themes');
 
 	require_once(ABSPATH . 'wp-admin/admin-header.php');
-	echo '<div class="wrap">';
-	echo '<h2>' . esc_html__('Update Themes') . '</h2>';
-	echo "<iframe src='$url' style='width: 100%; height: 100%; min-height: 750px;' frameborder='0'></iframe>";
-	echo '</div>';
+	?>
+	<div class="wrap">
+		<h1><?php _e( 'Update Themes' ); ?></h1>
+		<iframe src="<?php echo $url ?>" style="width: 100%; height: 100%; min-height: 750px;" frameborder="0" title="<?php esc_attr_e( 'Update progress' ); ?>"></iframe>
+	</div>
+	<?php
 	include(ABSPATH . 'wp-admin/admin-footer.php');
 
 } elseif ( 'do-translation-upgrade' == $action ) {
 
 	if ( ! current_user_can( 'update_core' ) && ! current_user_can( 'update_plugins' ) && ! current_user_can( 'update_themes' ) )
-		wp_die( __( 'You do not have sufficient permissions to update this site.' ) );
+		wp_die( __( 'Sorry, you are not allowed to update this site.' ) );
 
 	check_admin_referer( 'upgrade-translations' );
 
@@ -636,7 +726,7 @@ if ( 'upgrade-core' == $action ) {
 	/**
 	 * Fires for each custom update action on the WordPress Updates screen.
 	 *
-	 * The dynamic portion of the hook name, $action, refers to the
+	 * The dynamic portion of the hook name, `$action`, refers to the
 	 * passed update action. The hook fires in lieu of all available
 	 * default update actions.
 	 *