(PDB-2847) i18n enable the threadpool log messages
(PDB-2847) i18n enable the threadpool log messages

This commit wraps the string literals from
puppetlabs.puppetdb.threadpool in the appropriate i18n system local
translation macros.

kbarber/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb,mullr/puppetdb,rbrw/puppetdb,puppetlabs/puppetdb,rbrw/puppetdb,mullr/puppetdb,senior/puppetdb,rbrw/puppetdb,kbarber/puppetdb,rbrw/puppetdb,waynr/puppetdb,mullr/puppetdb,senior/puppetdb,waynr/puppetdb,senior/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb,senior/puppetdb,waynr/puppetdb,kbarber/puppetdb,kbarber/puppetdb,mullr/puppetdb,mullr/puppetdb,rbrw/puppetdb,waynr/puppetdb