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

(cherry picked from commit d35c514d8339a5a21e65a18d3ffcdb6320f3a738)
Doc: Translate admin/index

(cherry picked from commit a3588ad6da69b2cb76ceeabdb8766e3177585059)
Doc: Translate admin/getting-started

(cherry picked from commit 4bff80e2753a831cf3c95db459026d217b2abc00)
Doc: Translate reference/plugins/index

(cherry picked from commit 7743f76ac61d3b14e5c0bd6cb7206fcd63b38e82)
Doc: Translate reference/configuration/remap.config

(cherry picked from commit dcc400455ecc2138b723b3d51eaddc40342a6122)
Doc: Translate reference/configuration/index

(cherry picked from commit 69a9fa656be1a0233a5088b018b7f9fd8b68aa68)
Doc: Translate admin/reverse-proxy-http-redirects

(cherry picked from commit 3a0385124030a5bbc9881a51e3ebefcc6cc4724e)
Doc: Translate admin/security-options

(cherry picked from commit 9084da638ad1f9b0803d761752335294426f7777)
Doc: Translate beginning of referenece/configuration/records.config

(cherry picked from commit a58bc15e0eba7eb1bd9bd52e636a28920d168887)
Doc: Translate admin/traffic-server-error-messages

(cherry picked from commit 84e866fff370f00b9934275b716ad1111be9949e)
Doc: Translate admin/http-proxy-caching

(cherry picked from commit bdabb0c9ff2ef8476dd581e4225dd26316cda960)
Doc: Translate reference/configuration/congestion.config

(cherry picked from commit 47674126903dfef3b6e199a5f4737efa2b1b88e2)
Doc: Translate arch/index.en.rst

(cherry picked from commit 7310827b8cf39a8d7cb48e1f30eb0e651304971e)
Doc: Translate referenece/configuration/ssl_multicert.config

(cherry picked from commit ae52c77652dea3202947dcc1b5c735ee07dbc6e2)
Doc: Translate System Variables section of records.config

(cherry picked from commit 76acad560126107654f0d42668ebe6b1ee4cf566)
Doc: Translate reference/api/index

(cherry picked from commit f6bb4fcdec6ff60c82232a01a49e01c5a4886acc)
Doc: Translate reference/api/TSTrafficServerVersionGet

(cherry picked from commit 3cdd746bba11480ae0969a30a6a6565c98f7183a)
Doc: Translate reference/api/TSDebug

(cherry picked from commit a6d4c064eb0da2d87249091b0f6d6e3cbcc92015)