Index: wp-admin/includes/class-wp-upgrader.php
===================================================================
--- wp-admin/includes/class-wp-upgrader.php	(revision 20951)
+++ wp-admin/includes/class-wp-upgrader.php	(working copy)
@@ -1516,8 +1516,8 @@
 		$activate_link = wp_nonce_url( $activate_link, 'switch-theme_' . $template );
 
 		$install_actions = array();
-		$install_actions['preview']  = '<a href="' . esc_url( $preview_link ) . '" class="hide-if-customize" title="' . esc_attr(sprintf(__('Preview &#8220;%s&#8221;'), $name ) ) . '">' . __('Preview') . '</a>';
-		$install_actions['preview'] .= '<a href="' . wp_customize_url( $stylesheet ) . '" class="hide-if-no-customize load-customize">' . __('Customize') . '</a>';
+		$install_actions['preview']  = '<a href="' . esc_url( $preview_link ) . '" class="hide-if-customize" title="' . esc_attr( sprintf( __('Preview &#8220;%s&#8221;'), $name ) ) . '">' . __('Preview') . '</a>';
+		$install_actions['preview'] .= '<a href="' . wp_customize_url( $stylesheet ) . '" class="hide-if-no-customize load-customize">' . __('Live Preview') . '</a>';
 		$install_actions['activate'] = '<a href="' . esc_url( $activate_link ) . '" class="activatelink" title="' . esc_attr( sprintf( __('Activate &#8220;%s&#8221;'), $name ) ) . '">' . __('Activate') . '</a>';
 
 		if ( is_network_admin() && current_user_can( 'manage_network_themes' ) )
@@ -1579,8 +1579,8 @@
 			), admin_url('themes.php') );
 			$activate_link = wp_nonce_url( $activate_link, 'switch-theme_' . $template );
 
-			$update_actions['preview']  = '<a href="' . esc_url( $preview_link ) . '" class="hide-if-customize" title="' . esc_attr(sprintf(__('Preview &#8220;%s&#8221;'), $name ) ) . '">' . __('Preview') . '</a>';
-			$update_actions['preview'] .= '<a href="' . wp_customize_url( $stylesheet ) . '" class="hide-if-no-customize load-customize">' . __('Customize') . '</a>';
+			$update_actions['preview']  = '<a href="' . esc_url( $preview_link ) . '" class="hide-if-customize" title="' . esc_attr( sprintf( __('Preview &#8220;%s&#8221;'), $name ) ) . '">' . __('Preview') . '</a>';
+			$update_actions['preview'] .= '<a href="' . wp_customize_url( $stylesheet ) . '" class="hide-if-no-customize load-customize">' . __('Live Preview') . '</a>';
 			$update_actions['activate'] = '<a href="' . esc_url( $activate_link ) . '" class="activatelink" title="' . esc_attr( sprintf( __('Activate &#8220;%s&#8221;'), $name ) ) . '">' . __('Activate') . '</a>';
 
 			if ( ( ! $this->result || is_wp_error( $this->result ) ) || $stylesheet == get_stylesheet() )