How to replace recursively urlencoded lines in files with normal ones using bash?

Question

bash

There is an archive of a static html site, some links in which are made like "lista-fundaci%C3%B3n". Folders and files, respectively, are called normally - lista-fundación. When you click on a link with special characters, the server returns 404. How to bring it into the proper form? I'm trying to write a command for autocorrect, but I'm not strong in bash.

Answer 1

function urldecode() { : "${*//+/ }"; echo -e "${_//%/\\x}"; }
for f in encoded.html enpage.html; do
    urldecode `cat "$f"` > "$f"
done

urldecode()

Answer 2

grep 'lista-fundaci%C3%B3n' -P -R -I -l * | xargs sed -i 's/lista-fundaci%C3%B3n/lista-fundación/g'