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


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@429325 f38db490-d61c-443f-a65b-d21fe96a405b