(PDB-3051) benchmark: i18n & send user msgs to *err*
(PDB-3051) benchmark: i18n & send user msgs to *err*

Add translation for the remaining untranslated user-oriented messages,
and send all of them directly to *err* rather than indirectly to *err*
via logging.

mullr/puppetdb,mullr/puppetdb,puppetlabs/puppetdb,mullr/puppetdb,mullr/puppetdb,rbrw/puppetdb,puppetlabs/puppetdb,rbrw/puppetdb,puppetlabs/puppetdb,rbrw/puppetdb,mullr/puppetdb,rbrw/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb,rbrw/puppetdb