docs: fix i18n languange code error

mkdocs.yml

@@ -87,7 +87,7 @@ plugins:
       fallback_to_default: true
       reconfigure_material: true
       reconfigure_search: true
-      languages:
+     languages:
         - locale: zh
           name: 简体中文
           default: true
@@ -191,22 +191,30 @@ plugins:
             社区: Community
             社区贡献: Community Contribution
             附录: Appendix
-        - locale: jp
+        - locale: ja
           name: 日本語
           site_name: PaddleOCR ドキュメント
-          link: /jp/
+          link: /ja/
+          nav_translations:
+            Home: トップページ
         - locale: ru
           name: 俄语
           site_name: Документация PaddleOCR
           link: /ru/
-        - locale: hindi
+          nav_translations:
+            Home: Главная страница
+        - locale: hi
           name: 印地语
           site_name: पैडलओसीआर दस्तावेज़ीकरण
-          link: /hindi/
-        - locale: korean
+          link: /hi/
+          nav_translations:
+            Home: घर पृष्ठ
+        - locale: ko
           name: 韩语
           site_name: PaddleOCR 문서
-          link: /korean/
+          link: /ko/
+          nav_translations:
+            Home: 첫 페이지
         - locale: "null"
           name: Help translating
           build: false