If you installed more-gconv-modules and it helped, then you need to run after every re-installation of libc (in practice, after a firmware upgrade)

iconvconfig /usr/lib/more-gconv/

Or simply:

/var/lib/dpkg/info/more-gconv-modules.postinst

Edit: bugzilla lost comments from 6/01 to 9/01, so your comments were lost. You supposedly got mailed a copy of your comments, so you can re-add them.