Index: src/wp-includes/class-wp-customize-widgets.php
===================================================================
--- src/wp-includes/class-wp-customize-widgets.php	(revision 27834)
+++ src/wp-includes/class-wp-customize-widgets.php	(working copy)
@@ -573,7 +573,7 @@
 				'save_btn_label' => __( 'Apply' ),
 				// @todo translate? do we want these tooltips?
 				'save_btn_tooltip' => ( 'Save and preview changes before publishing them.' ),
-				'remove_btn_label' => __( 'Remove' ),
+				'remove_btn_label' => __( 'Delete' ),
 				'remove_btn_tooltip' => ( 'Trash widget by moving it to the inactive widgets sidebar.' ),
 				'error' => __( 'An error has occurred. Please reload the page and try again.' ),
 			),