This bug is fixed in upstream CVS. This is the changelog entry from
libc/localedata/:
2003-09-21 Jordi Mallach <jordi@gnu.org>
* locales/ca_ES: Fix mon_grouping, int_frac_digits and frac_digits
values.
* locales/eu_ES: Fix int_frac_digits and frac_digits values.
* locales/gl_ES: Likewise.