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)
........

Merged revisions 402224 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 402225 from http://svn.asterisk.org/svn/asterisk/branches/11
........

Merged revisions 402226 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@402227 f38db490-d61c-443f-a65b-d21fe96a405b