Fall back to ASCII if Unicode locale is unavailable (Guus). Also queue up startup error messages and display them before the newgame screen instead of emitting them to stderr.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2882 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on November 20, 2007
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