TS-2568 Better template messages

Conflicts:
	CHANGES
Add a more or less best guess as to what the release date will be, update as
we know more about the next RC candidate.
Doc: Generate *.po files for Japanese translations
Doc: Translate admin/index
Doc: Translate admin/getting-started
Doc: Translate reference/plugins/index
Doc: Translate reference/configuration/remap.config
Doc: Translate reference/configuration/index
Doc: Translate admin/reverse-proxy-http-redirects
Doc: Translate admin/security-options
Doc: Translate beginning of referenece/configuration/records.config
Doc: Translate admin/traffic-server-error-messages
Doc: Translate admin/http-proxy-caching
Doc: Translate reference/configuration/congestion.config
Doc: Translate arch/index.en.rst
Doc: Translate referenece/configuration/ssl_multicert.config
Doc: Translate System Variables section of records.config
Doc: Translate reference/api/index
Doc: Translate reference/api/TSTrafficServerVersionGet
Doc: Translate reference/api/TSDebug