Deep-link to the license section of a file page

The necessary anchor link depends on the language used on Wikimedia Commons:

* https://commons.wikimedia.org/wiki/File:GATEWAY_(Moon_Space_Station).png?uselang=en#Licensing
* https://commons.wikimedia.org/wiki/File:GATEWAY_(Moon_Space_Station).png?uselang=de#Lizenz
* Ref: https://commons.wikimedia.org/wiki/Template:License-header

Remove jsduck due to lacking support for ES6 string templates.

Bug: T336708
Change-Id: Ib71e647682835baa71bd375ae3098966ae01f26c

extension.json

@@ -107,6 +107,7 @@
 				"mmv.head"
 			],
 			"messages": [
+				"license-header",
 				"multimediaviewer-file-page",
 				"multimediaviewer-options-learn-more",
 				"multimediaviewer-options-dialog-header",

jsduck.json

@@ -1,12 +0,0 @@
-{
-	"--title": "MultimediaViewer - Documentation",
-	"--categories": "jsduck.categories.json",
-	"--builtin-classes": true,
-	"--processes": "0",
-	"--warnings-exit-nonzero": true,
-	"--output": "docs",
-	"--": [
-		"jsduck.external.js",
-		"resources/"
-	]
-}

package.json

@@ -5,7 +5,7 @@
 		"build": "npm -s run minify-svg",
 		"test": "grunt test",
 		"minify-svg": "svgo --config=.svgo.config.js --quiet --recursive --folder resources/",
-		"doc": "jsduck"
+		"doc": ""
 	},
 	"devDependencies": {
 		"eslint-config-wikimedia": "0.25.0",

resources/mmv/ui/mmv.ui.metadataPanel.js

@@ -540,6 +540,8 @@
 	MPP.setLicense = function ( license, filePageUrl ) {
 		var shortName, url, isCc, isPd;
 
+		filePageUrl += `?uselang=${mw.config.get( 'wgUserLanguage' )}#${mw.message( 'license-header' ).text()}`;
+
 		if ( license ) {
 			shortName = license.getShortName();
 			url = license.deedUrl || filePageUrl;

tests/qunit/mmv/ui/mmv.ui.metadataPanel.test.js

@@ -123,7 +123,8 @@ QUnit.test( '.setImageInfo()', function ( assert ) {
 
 	assert.strictEqual( panel.$title.text(), title, 'Title is correctly set' );
 	assert.notStrictEqual( panel.$credit.text(), '', 'Default credit is shown' );
-	assert.strictEqual( panel.$license.prop( 'href' ), imageData.descriptionUrl,
+	assert.strictEqual( panel.$license.prop( 'href' ),
+		imageData.descriptionUrl + '?uselang=qqx#(license-header)',
 		'User is directed to file page for license information' );
 	assert.strictEqual( panel.$license.prop( 'target' ), '', 'License information opens in same window' );
 	assert.true( panel.$datetimeLi.hasClass( 'empty' ), 'Date/Time is empty' );