(www-parse-string-as-space-separated-char-list): Expect `string' not

(www-parse-string-as-space-separated-char-list): Expect `string' not
to be decoded by `decode-uri-string'.
(www-parse-string-as-space-separated-ids): Likewise.
(www-feature-parse-string): Likewise.
(www-set-display-char-desc): Expect `uri-char' not to be decoded by
`decode-uri-string'.
(www-set-display-feature-desc): Fix problem when `name@lang' is not
existed.
(www-batch-set): Don't use `decode-uri-string' for value of `char' and
feature-value.