Hi could someone test this version of the Spanish keyboard?
Just paste the files es.yaml es_wide.yaml /terminal/es.yaml /terminal/es_wide.yaml in /home/purism/.local/share/squeekboard/keyboards/
The changes compared with the one that is installed by default are minimal, you can see them here
Mainly is that if you press shift the Backspace changes to a Delete button and some especial characters are moved to other places, and added the wide and terminal versions.
If you want to come back to the default one, that was made by me years ago just remove theses files.