Show Last time the plants were watered

Here’s a solution for weekday and month names that effectively duplicates the specific timestamp_custom output in Spanish, but it should be easier than this. I’m assuming your abbreviations are just the first three letters of each full name. Pop this in the template editor to adjust how you want, and swap in your timestamp in place of now() as required:

English: {{ now()|as_timestamp()|timestamp_custom("%a %d %h %H:%M") }}
Español: {{ "%s %d %s %02d:%02d" %
            (["Lun","Mar","Mié","Jue","Vie","Sáb","Dom"][now().weekday()],
             now().day,
             ["Ene","Feb","Mar","Abr","May","Jun","Jul","Ago","Sep","Oct","Nov","Dic"][now().month-1],
             now().hour,
             now().minute) }}