add Polish language support to Voicemail, with some minor modifications that

include formatting fixes, making it so variables aren't declared in the
middle of a block, and various other little code cleanups
(issue #6970, supczinskib)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@25159 65c4cc65-6c06-0410-ace0-fbb531ad65f3