convert all mailman global language templates for listinfo pages (back) to UTF-8, remove all illegal characters (that break puppet), add correct characters instead, re-declare them as UTF-8 files
The fix described on T114289#1691038 for German needs to be applied to multiple other languages as well.
affected were Korean, German (linked tickets) and the following:
~/wmf/puppet/modules/mailman/files/templates$ find . -name listinfo.html -exec file {} \; | grep -v UTF-8
./ro/listinfo.html: HTML document, ASCII text
./ca/listinfo.html: HTML document, ISO-8859 text
./nl/listinfo.html: HTML document, ASCII text
./es/listinfo.html: HTML document, ISO-8859 text
./it/listinfo.html: HTML document, ASCII text
./fi/listinfo.html: HTML document, ISO-8859 text
./id/listinfo.html: HTML document, ASCII text
./en/listinfo.html: HTML document, ASCII text