Ensure passing empty array to SmtpTransport::config() does not reset existing config.
Synced args and return value with AbstractTransport::config().

Fixes #3840
fix some domain translations and remove leftover true param from 1.x
unify "Are you sure you want to delete"
Merge pull request #1295 from cakephp/master-i18n-fixes

Master i18n fixes
Merge pull request #1294 from ADmad/2.3-bugfix-smtp

Ensure passing empty array to SmtpTransport::config() does not reset exi...
Fix docblock