I don't want to use the word "see" with pxref, but the Spanish word
"consulte", because I'm writing the manual in English, it's a
translation of the Bash Reference Manual.
If I understand correctly, you want:
@documentlanguage es
As described here:
https://www.gnu.org/software/texinfo/manual/texinfo/texinfo.html#g_t_0040documentlanguage
However, the person who created the translations for Spanish chose to
translate "see" as "v@'ease" rather than "consulte". (At least for TeX,
file txi-es.tex; I didn't check makeinfo.) Not knowing Spanish, I can't
comment further :( ...
Happy translating,
Karl
