修复：切换语言时浏览器页签标题语言不改变的问题；🐛

fix: the problem that the title language of the browser tab does not change when switching languages;

src/App.vue

@@ -31,6 +31,7 @@ export default {
     },
     lang(val) {
       this.setLanguage(val)
+      this.setHtmlTitle()
     },
     $route() {
       this.setHtmlTitle()