Index: src/wp-admin/network/themes.php
===================================================================
--- src/wp-admin/network/themes.php	(revision 32067)
+++ src/wp-admin/network/themes.php	(working copy)
@@ -182,9 +182,9 @@
 						wp_nonce_field( 'bulk-themes' );
 
 						if ( 1 == $themes_to_delete ) {
-							submit_button( __( 'Yes, Delete this theme' ), 'button', 'submit', false );
+							submit_button( __( 'Yes, delete this theme' ), 'button', 'submit', false );
 						} else {
-							submit_button( __( 'Yes, Delete these themes' ), 'button', 'submit', false );
+							submit_button( __( 'Yes, delete these themes' ), 'button', 'submit', false );
 						}
 					?>
 				</form>