Need your suggestions . . . I am publishing 30 volume epub series in 20 foreign languages

I could not get even a teeny clear answer from Apple Books support. They just rudely brushed me off, did not tell me how to find the information I need, and implied they wished I would “get lost” (sic. my words, their vibration). Really unprofessional. How classically “Apple”. I have never received serious professional support from Apple, neither for Ipad or any other product.

Here are my questions. Everybody’s help is appreciated.

I only speak English. But I have used AI technology to translate a 30 volume English-language epub collection (already published in Apple Books) into additional languages.

QUESTION 1:

When I upload a translated epub (in Spanish), the “Language” field allows me to choose “Spanish”.

For primary/secondary category I can enter “New age spirituality”. (I am entering all this in English).

When published in Apple Books, will that category be converted into Spanish for the Spanish-speaking customer? (i.e. “Espiritualidad de la Nueva Era”?)

QUESTION 2:

Our original 30-volume book series is called:

Ascended Master Series

To make management easier, I was considering creating a NEW SERIES for each of the translated 30-v0lume ebooks . . . like this . .

Spanish Ascended Master Series

German Ascended Master Series

French Ascended Master Series

Is that a good approach? . . . . to make a uniquely-named new "series" for each group of 30 same-language epubs?

QUESTION 3:

If the person publishing in Apple Books is Chinese speaking rather than English, does he get directed to a Chinese iconnect control panel to facilitate entry in his language?

Just curious.

Thanks for anyone's help.