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function.
(set-language-info): Call set-language-info-internal to update
language-info-alist.  If LANG-ENV is the current one, call
set-language-environment to make INFO effective now.
(set-language-info-alist): Likewise.
(locale-language-names): With locale "en", use English
lang. env. but set the default codings to iso-8859-1.