This patch embeds the process of creating pre-translated error templates
from .po
* installs/uninstalls base templates for failover backup if no
translation is to be done.
* Adds dependency on translation toolkit po2html for 'make dist' target.
* Adds 'make translate' target
* Adjusts 'make all' to do translation.
* Adds --without-po2html configure option to optionally skip the
translation step unless explicitly asked for ('make translate').
* Installs translated files properly, and skips silently if missing.
* Un-installs translated files, and skips silently if missing.