fix: RSS Language Tag for Engadget (#5331)

lib/router.js

@@ -2058,7 +2058,7 @@ router.get('/pintu360/:type?', require('./routes/pintu360/index'));
 router.get('/engadget-cn', require('./routes/engadget/home'));
 
 // engadget
-router.get('/engadget/:lang', require('./routes/engadget/home'));
+router.get('/engadget/:lang?', require('./routes/engadget/home'));
 
 // 吹牛部落
 router.get('/chuiniu/column/:id', require('./routes/chuiniu/column'));

lib/routes/engadget/home.js

@@ -57,6 +57,7 @@ module.exports = async (ctx) => {
         title: feed.title,
         link: feed.link,
         description: feed.description,
+        language: feed.language,
         item: items,
     };
 };