ARI/AMI: Include language in standard channel snapshot output

Adding information about including "language" in the standard channel snapshot
output to the CHANGES file. Note the actual source changes have already been
previously committed.

ASTERISK-24553
Reported by: Matt Jordan
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Merged revisions 429325 from http://svn.asterisk.org/svn/asterisk/branches/12
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Merged revisions 429326 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@429327 65c4cc65-6c06-0410-ace0-fbb531ad65f3