gettext

446241c7 - its: Fix the value of the xml:lang attribute inserted by msgfmt.

its: Fix the value of the xml:lang attribute inserted by msgfmt. Reported by Matthias Klumpp <matthias@tenstral.net> at <https://savannah.gnu.org/bugs/?64025>. * autogen.sh (GNULIB_MODULES_TOOLS_FOR_SRC): Add bcp47. * gettext-tools/src/its.c: Include "bcp47.h". (its_merge_context_merge_node): Convert the language / locale name to BCP 47 syntax before storing it in the xml:lang attribute. * gettext-tools/tests/msgfmt-xml-3: New file. * gettext-tools/tests/Makefile.am (TESTS): Add it. * NEWS: Mention the change.