I'm using txi-ca.tex in the development branch, which extended texinfo to the Catalan language and allowed for some UTF-8 characters used in Catalan (like the interpunct between l's). But I found out that accented capital letters, which in Catalan are:
À, È, É, Í, Ó, Ò, Ú are not allowed in node definitions. I attach a small example. I believe this is a problem also in Spanish and other languages. -- Walter Garcia-Fontes
test.texi
Description: TeXInfo document
