Changing the Default Language in WordPress
Changing the default language in WordPress is easy. Open the Settings page in your WordPress admin panel and scroll down to the Language section. There you will see a list of languages that WordPress can display content in. To change the default language, simply select the language you want to use from the list and click the Update button.
WordPress will then use that language for all new posts, pages, comments, and media content. If you want to revert to the default language, select the English language from the list and click the Update button again.