diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-admin/includes/theme-install.php
--- a/wp/wp-admin/includes/theme-install.php	Tue Jun 09 11:14:17 2015 +0000
+++ b/wp/wp-admin/includes/theme-install.php	Mon Oct 14 17:39:30 2019 +0200
@@ -1,6 +1,6 @@
 <?php
 /**
- * WordPress Theme Install Administration API
+ * WordPress Theme Installation Administration API
  *
  * @package WordPress
  * @subpackage Administration
@@ -29,7 +29,7 @@
  * @return array
  */
 function install_themes_feature_list() {
-	_deprecated_function( __FUNCTION__, '3.1', 'get_theme_feature_list()' );
+	_deprecated_function( __FUNCTION__, '3.1.0', 'get_theme_feature_list()' );
 
 	if ( !$cache = get_transient( 'wporg_theme_feature_list' ) )
 		set_transient( 'wporg_theme_feature_list', array(), 3 * HOUR_IN_SECONDS );
@@ -50,6 +50,8 @@
  * Display search form for searching themes.
  *
  * @since 2.8.0
+ *
+ * @param bool $type_selector
  */
 function install_theme_search_form( $type_selector = true ) {
 	$type = isset( $_REQUEST['type'] ) ? wp_unslash( $_REQUEST['type'] ) : 'term';
@@ -83,7 +85,7 @@
 	<label class="screen-reader-text" for="s"><?php _e('Search by keyword'); ?></label>
 	<?php endif; ?>
 	<input type="search" name="s" id="s" size="30" value="<?php echo esc_attr($term) ?>" autofocus="autofocus" />
-	<?php submit_button( __( 'Search' ), 'button', 'search', false ); ?>
+	<?php submit_button( __( 'Search' ), '', 'search', false ); ?>
 </form>
 <?php
 }
@@ -128,31 +130,37 @@
 
 </div>
 <br class="clear" />
-<?php submit_button( __( 'Find Themes' ), 'button', 'search' ); ?>
+<?php submit_button( __( 'Find Themes' ), '', 'search' ); ?>
 </form>
 <?php
 }
-// add_action('install_themes_dashboard', 'install_themes_dashboard');
 
+/**
+ * @since 2.8.0
+ */
 function install_themes_upload() {
 ?>
 <p class="install-help"><?php _e('If you have a theme in a .zip format, you may install it by uploading it here.'); ?></p>
 <form method="post" enctype="multipart/form-data" class="wp-upload-form" action="<?php echo self_admin_url('update.php?action=upload-theme'); ?>">
-	<?php wp_nonce_field( 'theme-upload'); ?>
-	<input type="file" name="themezip" />
-	<?php submit_button( __( 'Install Now' ), 'button', 'install-theme-submit', false ); ?>
+	<?php wp_nonce_field( 'theme-upload' ); ?>
+	<label class="screen-reader-text" for="themezip"><?php _e( 'Theme zip file' ); ?></label>
+	<input type="file" id="themezip" name="themezip" />
+	<?php submit_button( __( 'Install Now' ), '', 'install-theme-submit', false ); ?>
 </form>
 	<?php
 }
-// add_action('install_themes_upload', 'install_themes_upload', 10, 0);
 
 /**
  * Prints a theme on the Install Themes pages.
  *
  * @deprecated 3.4.0
+ *
+ * @global WP_Theme_Install_List_Table $wp_list_table
+ *
+ * @param object $theme
  */
 function display_theme( $theme ) {
-	_deprecated_function( __FUNCTION__, '3.4' );
+	_deprecated_function( __FUNCTION__, '3.4.0' );
 	global $wp_list_table;
 	if ( ! isset( $wp_list_table ) ) {
 		$wp_list_table = _get_list_table('WP_Theme_Install_List_Table');
@@ -165,6 +173,8 @@
  * Display theme content based on theme list.
  *
  * @since 2.8.0
+ *
+ * @global WP_Theme_Install_List_Table $wp_list_table
  */
 function display_themes() {
 	global $wp_list_table;
@@ -176,15 +186,13 @@
 	$wp_list_table->display();
 
 }
-// add_action('install_themes_search', 'display_themes');
-// add_action('install_themes_featured', 'display_themes');
-// add_action('install_themes_new', 'display_themes');
-// add_action('install_themes_updated', 'display_themes');
 
 /**
  * Display theme information in dialog box form.
  *
  * @since 2.8.0
+ *
+ * @global WP_Theme_Install_List_Table $wp_list_table
  */
 function install_theme_information() {
 	global $wp_list_table;
@@ -194,7 +202,7 @@
 	if ( is_wp_error( $theme ) )
 		wp_die( $theme );
 
-	iframe_header( __('Theme Install') );
+	iframe_header( __('Theme Installation') );
 	if ( ! isset( $wp_list_table ) ) {
 		$wp_list_table = _get_list_table('WP_Theme_Install_List_Table');
 	}
@@ -202,4 +210,3 @@
 	iframe_footer();
 	exit;
 }
-add_action('install_themes_pre_theme-information', 'install_theme_information');