fix wiki_API.langlinks

Author: kanasimi

application/net/wiki/data.js

@@ -1150,19 +1150,20 @@ function module_code(library_namespace) {
 	 */
 	function get_entity_link(entity, language) {
 		var sitelinks = entity && entity.sitelinks;
-		if (sitelinks) {
+		if (!sitelinks) {
+			return;
+		}
+
+		if (language) {
 			var link = sitelinks[wiki_API.site_name(language)];
-			if (link) {
-				return link.title;
-			}
-			if (!language) {
-				link = [];
-				for (language in sitelinks) {
-					link.push(sitelinks[language].title);
-				}
-				return link;
-			}
+			return link && link.title;
+		}
+
+		var links = [];
+		for (language in sitelinks) {
+			links.push(sitelinks[language].title);
 		}
+		return links;
 	}
 
 	// https://www.wikidata.org/w/api.php?action=help&modules=wbgetentities

application/net/wiki/list.js

@@ -2322,6 +2322,20 @@ function module_code(library_namespace) {
 	 *      https://www.mediawiki.org/wiki/Manual:Langlinks_table
 	 */
 	wiki_API.langlinks = function(title, callback, to_lang, options) {
+		if (!options && library_namespace.is_Object(to_lang)) {
+			// shift
+			options = to_lang;
+			to_lang = null;
+		}
+		// 前置處理。
+		options = library_namespace.new_options(options);
+
+		var session = wiki_API.session_of_options(options);
+		if (session && !to_lang) {
+			// e.g., simplewiki
+			to_lang = session.first_damain_name || session.language;
+		}
+
 		var from_lang;
 		if (is_api_and_title(title, 'language', Object.assign({
 			ignore_API_test : true