After multiple languages are enabled, switch to other languages, and an error will be displayed when the form is opened.However, it is normal to open the form in the default language of the website.The default language of this website is English.

After multiple languages are enabled, switch to other languages, and an error will be displayed when the form is opened.However, it is normal to open the form in the default language of the website.The default language of this website is English.
Hi @owenliao
All your queries are answered in the below thread
1. First install language in the CDS
2. Enable metadata translation
3. Enable attributes
Please follow each step. Then you are good to go.
Hope it helps.
------------
If you like this post, give it a Thumbs up. Where it solved your request, Mark it as a Solution to enable other users to find it.