Hello Tianyi,

Thank you for reaching out to us.

The translation of the "days and months" on the Calendar for the Appointment time slots is based on a 3rd Party library,

which will automatically translate if you have the correct language locale set up on the WordPress page.

We have most languages covered - but in some rare situations, we find a new language that is still not added to this library.

In that case, our developers build the new language and add it during an update.

We will elaborate more on how it works :

For example, let's say we wanted to translate the day labels of the Calendar above Time slots to French.

If I change my site language to French, Amelia automatically "triggers the translated library" for the months and days in the Calendar to French :

Here is how it looks if i leave WordPress language in General WordPress settings as English

-

And now, if I change WordPress language to French :

If you just need one language, set it as the WordPress default language in General settings and this should work.

If you need a multilingual site with Amelia, you will have to set up different page versions for each language you need with the help of a multilingual plugin.

Please check more about Multilingual Support in Amelia here,

and an additional article here: Using Multiple Languages in Amelia

Let me know how it goes and if you have any questions. Thank you