trivial: Only include a single language in the metainfo silo
trivial: Only include a single language in the metainfo silo

Return the warnings in the C locale like we did with appstream-glib.

vathpela/fwupd,fwupd/fwupd,fwupd/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,vathpela/fwupd,fwupd/fwupd,vathpela/fwupd,vathpela/fwupd