Updates for 1.4.25 core sounds and 1.4.14 extra sounds, plus new en_GB language set

Updates for 1.4.25 core sounds and 1.4.14 extra sounds, plus new en_GB language set

The new sound packages relate to issues: ASTERISK-22544, ASTERISK-22411, ASTERISK-21413, ASTERISK-20782
Modified sounds/Makefile for the new sound versions and to account for the new en_GB language set.

(issue ASTERISK-22659)
(closes issue ASTERISK-22659)
(closes issue ASTERISK-22411)
(closes issue ASTERISK-22544)
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Merged revisions 402224 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 402225 from http://svn.asterisk.org/svn/asterisk/branches/11

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@402226 65c4cc65-6c06-0410-ace0-fbb531ad65f3