app_voicemail, say: Add support for Japanese Language

This patch adds support for the Japanese language to both the say family of
applications, as well as for VoiceMail and VoiceMailMain. A new pack of
language sounds will be released at the same time as the next major version
of Asterisk to support the new language features.

The language features can be enabled using a language code of 'ja'.

Review: https://reviewboard.asterisk.org/r/3477

ASTERISK-23324 #close
Reported by: Kevin McCoy
patches:
  app_voicemail.c.20140226.jb.patch uploaded by Kevin McCoy (License 6586)
  say.c.20140226.jb.patch uploaded by Kevin McCoy (License 6586)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@417591 65c4cc65-6c06-0410-ace0-fbb531ad65f3