(reset-language-environment): Don't

(reset-language-environment): Don't
set nonascii-translation-table and nonascii-insert-offset.  Call
set-unibyte-charset, not set-primary-charset.
(nonascii-translation-table, nonascii-insert-offset): Declare
these variable as obsolete ones.
(set-language-environment): Call set-unibyte-charset, not
set-primary-charset.  Call set-charset-priority with `charset'
info of the language environment.