e_charset_add_radio_actions ()
GSList *
e_charset_add_radio_actions (GtkActionGroup *action_group,
                             const gchar *action_prefix,
                             const gchar *default_charset,
                             GCallback callback,
                             gpointer user_data);
Adds a set of GtkRadioActions for available character sets to
action_group
.  The default_charset
 (or locale character set if
default_charset
 is NULL) will be added first, and selected by
default (except that ISO-8859-1 will always be used instead of
US-ASCII).  Any other character sets of the same language class as
the default will be added next, followed by the remaining character
sets.
Returns
 the radio action group