Require `format'.
(iso-translate-conventions): Take bounds as args.
(iso-spanish, iso-german): Take bounds as args.
(iso-iso2tex, iso-tex2iso, iso-gtex2iso, iso-iso2gtex): Likewise.
(iso-iso2duden-trans-tab): New variable.
(iso-iso2duden): New command.
(iso-cvt-read-only, iso-cvt-write-only): New commands.
(is-german-tex-p): Function deleted.
(iso-fix-iso2tex, iso-fix-tex2iso): Functions deleted.
(iso-cvt-ffh, iso-cvt-wfh, iso-cvt-ash): Functions deleted.
(iso-cvt-define-menu): New function.