diff -r c7c34916027a -r 177826044cd9 wp/wp-admin/includes/class-theme-upgrader-skin.php
--- a/wp/wp-admin/includes/class-theme-upgrader-skin.php	Mon Oct 14 18:06:33 2019 +0200
+++ b/wp/wp-admin/includes/class-theme-upgrader-skin.php	Mon Oct 14 18:28:13 2019 +0200
@@ -19,16 +19,20 @@
 	public $theme = '';
 
 	/**
-	 *
 	 * @param array $args
 	 */
-	public function __construct($args = array()) {
-		$defaults = array( 'url' => '', 'theme' => '', 'nonce' => '', 'title' => __('Update Theme') );
-		$args = wp_parse_args($args, $defaults);
+	public function __construct( $args = array() ) {
+		$defaults = array(
+			'url'   => '',
+			'theme' => '',
+			'nonce' => '',
+			'title' => __( 'Update Theme' ),
+		);
+		$args     = wp_parse_args( $args, $defaults );
 
 		$this->theme = $args['theme'];
 
-		parent::__construct($args);
+		parent::__construct( $args );
 	}
 
 	/**
@@ -38,37 +42,50 @@
 
 		$update_actions = array();
 		if ( ! empty( $this->upgrader->result['destination_name'] ) && $theme_info = $this->upgrader->theme_info() ) {
-			$name       = $theme_info->display('Name');
+			$name       = $theme_info->display( 'Name' );
 			$stylesheet = $this->upgrader->result['destination_name'];
 			$template   = $theme_info->get_template();
 
-			$activate_link = add_query_arg( array(
-				'action'     => 'activate',
-				'template'   => urlencode( $template ),
-				'stylesheet' => urlencode( $stylesheet ),
-			), admin_url('themes.php') );
+			$activate_link = add_query_arg(
+				array(
+					'action'     => 'activate',
+					'template'   => urlencode( $template ),
+					'stylesheet' => urlencode( $stylesheet ),
+				),
+				admin_url( 'themes.php' )
+			);
 			$activate_link = wp_nonce_url( $activate_link, 'switch-theme_' . $stylesheet );
 
 			$customize_url = add_query_arg(
 				array(
-					'theme' => urlencode( $stylesheet ),
+					'theme'  => urlencode( $stylesheet ),
 					'return' => urlencode( admin_url( 'themes.php' ) ),
 				),
 				admin_url( 'customize.php' )
 			);
 			if ( get_stylesheet() == $stylesheet ) {
 				if ( current_user_can( 'edit_theme_options' ) && current_user_can( 'customize' ) ) {
-					$update_actions['preview']  = '<a href="' . esc_url( $customize_url ) . '" class="hide-if-no-customize load-customize"><span aria-hidden="true">' . __( 'Customize' ) . '</span><span class="screen-reader-text">' . sprintf( __( 'Customize &#8220;%s&#8221;' ), $name ) . '</span></a>';
+					$update_actions['preview']  = '<a href="' . esc_url( $customize_url ) . '" class="hide-if-no-customize load-customize">';
+					$update_actions['preview'] .= '<span aria-hidden="true">' . __( 'Customize' ) . '</span>';
+					/* translators: %s: theme name */
+					$update_actions['preview'] .= '<span class="screen-reader-text">' . sprintf( __( 'Customize &#8220;%s&#8221;' ), $name ) . '</span></a>';
 				}
 			} elseif ( current_user_can( 'switch_themes' ) ) {
 				if ( current_user_can( 'edit_theme_options' ) && current_user_can( 'customize' ) ) {
-					$update_actions['preview'] = '<a href="' . esc_url( $customize_url ) . '" class="hide-if-no-customize load-customize"><span aria-hidden="true">' . __( 'Live Preview' ) . '</span><span class="screen-reader-text">' . sprintf( __( 'Live Preview &#8220;%s&#8221;' ), $name ) . '</span></a>';
+					$update_actions['preview']  = '<a href="' . esc_url( $customize_url ) . '" class="hide-if-no-customize load-customize">';
+					$update_actions['preview'] .= '<span aria-hidden="true">' . __( 'Live Preview' ) . '</span>';
+					/* translators: %s: theme name */
+					$update_actions['preview'] .= '<span class="screen-reader-text">' . sprintf( __( 'Live Preview &#8220;%s&#8221;' ), $name ) . '</span></a>';
 				}
-				$update_actions['activate'] = '<a href="' . esc_url( $activate_link ) . '" class="activatelink"><span aria-hidden="true">' . __( 'Activate' ) . '</span><span class="screen-reader-text">' . sprintf( __( 'Activate &#8220;%s&#8221;' ), $name ) . '</span></a>';
+				$update_actions['activate']  = '<a href="' . esc_url( $activate_link ) . '" class="activatelink">';
+				$update_actions['activate'] .= '<span aria-hidden="true">' . __( 'Activate' ) . '</span>';
+				/* translators: %s: theme name */
+				$update_actions['activate'] .= '<span class="screen-reader-text">' . sprintf( __( 'Activate &#8220;%s&#8221;' ), $name ) . '</span></a>';
 			}
 
-			if ( ! $this->result || is_wp_error( $this->result ) || is_network_admin() )
+			if ( ! $this->result || is_wp_error( $this->result ) || is_network_admin() ) {
 				unset( $update_actions['preview'], $update_actions['activate'] );
+			}
 		}
 
 		$update_actions['themes_page'] = '<a href="' . self_admin_url( 'themes.php' ) . '" target="_parent">' . __( 'Return to Themes page' ) . '</a>';
@@ -78,12 +95,13 @@
 		 *
 		 * @since 2.8.0
 		 *
-		 * @param array  $update_actions Array of theme action links.
-		 * @param string $theme          Theme directory name.
+		 * @param string[] $update_actions Array of theme action links.
+		 * @param string   $theme          Theme directory name.
 		 */
 		$update_actions = apply_filters( 'update_theme_complete_actions', $update_actions, $this->theme );
 
-		if ( ! empty($update_actions) )
-			$this->feedback(implode(' | ', (array)$update_actions));
+		if ( ! empty( $update_actions ) ) {
+			$this->feedback( implode( ' | ', (array) $update_actions ) );
+		}
 	}
 }