s/Login/Username/ to restore 3.0 string. props demetris, fixes #15453.

git-svn-id: https://develop.svn.wordpress.org/trunk@16428 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/includes/class-wp-ms-users-list-table.php

@@ -117,7 +117,7 @@ class WP_MS_Users_List_Table extends WP_List_Table {
 	function get_columns() {
 		$users_columns = array(
 			'cb'         => '<input type="checkbox" />',
-			'login'      => __( 'Login' ),
+			'login'      => __( 'Username' ),
 			'name'       => __( 'Name' ),
 			'email'      => __( 'E-mail' ),
 			'registered' => _x( 'Registered', 'user' ),

wp-admin/includes/class-wp-users-list-table.php

@@ -120,7 +120,7 @@ class WP_Users_List_Table extends WP_List_Table {
 	function get_columns() {
 		return array(
 			'cb'       => '<input type="checkbox" />',
-			'username' => __( 'Login' ),
+			'username' => __( 'Username' ),
 			'name'     => __( 'Name' ),
 			'email'    => __( 'E-mail' ),
 			'role'     => __( 'Role' ),