ARI/AMI: Include language in standard channel snapshot output

The CHANGES verbiage for the "language" addition had been put under the wrong
release. This moves it to be under 13.1 to 13.2 changes.

ASTERISK-24553
Reported by: Matt Jordan


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/13@429387 f38db490-d61c-443f-a65b-d21fe96a405b