i18n: detect UI language without POSIX-style locale variable on Windows (BC)
On Windows, it isn't common to set LANG environment variable. This patch makes
gettext honor Windows-style UI language [1] if no locale variables are set.
Because of this change, LANG=C or HGPLAIN must be set in order to disable
translation on non-English Windows.
[1]: http://msdn.microsoft.com/en-us/library/dd374098(v=VS.85).aspx
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