Remove inactive Documentation translations
Remove the Czech, Dutch, Portuguese, and Hungarian translations, as proposed on the mailing list: https://lists.gnu.org/archive/html/lilypond-devel/2023-01/msg00048.html
Remove the Czech, Dutch, Portuguese, and Hungarian translations, as proposed on the mailing list: https://lists.gnu.org/archive/html/lilypond-devel/2023-01/msg00048.html