while showing the notification in Spanish; the description shows in Spanish and the action buttons are in English and vice-versa
Which buttons precisely ?
What is the iPhone language setting ?
I do not find where you tried to ;localise those buttons ; if so, they are displayed in the language of settings.
Have a look here for a somewhat similar issue:
https://developer.apple.com/forums/thread/667963?page=1#649779022
Topic:
Accessibility & Inclusion
SubTopic:
General
Tags: