fix(build): add lang query parameter to helpUrl when builing with a locale (#1909)

* fix(build); add lang query parameter to helpUrl when builing with a locale

* add test

* fix test

Author: straker

build/configure.js

@@ -276,6 +276,7 @@ function buildRules(grunt, options, commons, callback) {
 			auto: replaceFunctions(
 				JSON.stringify(
 					{
+						lang: options.locale || 'en',
 						data: metadata,
 						rules: rules,
 						checks: checks,

lib/core/base/audit.js

@@ -308,6 +308,7 @@ Audit.prototype._init = function() {
 
 	axe.commons = commons = audit.commons;
 
+	this.lang = audit.lang || 'en';
 	this.reporter = audit.reporter;
 	this.commands = {};
 	this.rules = [];

test/core/public/load.js

@@ -49,6 +49,13 @@ describe('axe._load', function() {
 		assert.equal(axe.commons, 'foo');
 	});
 
+	it('should load with a lang', function() {
+		axe._load({
+			lang: 'ja'
+		});
+		assert.equal(axe._audit.lang, 'ja');
+	});
+
 	describe('respondable subscriber', function() {
 		it('should add a respondable subscriber', function() {
 			var mockAudit = {