One org-mode file started showing strange coding instead of spanish characters (á, é, ...). Instead of "Música" and "fotografía" it shows "M\303\272sica" and "fotograf\303\203\302\255a".
I'm using Spacemacs 0.200.13 on Emacs 26.3 in Linux Mint 19.2
I tried setting the coding in the file using:
% -- coding: utf-8 --
and now "Música" appears correctly, but "fotografía" now reads "fotografÃa".
I'd like to know where to set the coding correctly, if globally in .spacemacs or somewhere else, or inside the problematic file (no problems with other org files). And which coding to use for spanish.