hi again... this is my personal opinion, pls correct me if im wrong.
The language plugin provided by CB default and CB translators consist of most back-end and front-end language. Few elements are hard-coded, true, but most part are covered by common translation plugin files for CB. Of course, to change CB's back-end language, u also need to change
Joomla's back-end language to the corresponding (which is quite difficult to find btw).
if u are looking to build a plugin on your own, i think the CB language plugin is the best place to start. But if u are looking for a fully-built-translation-manager-plugin-for-frontend-and-backend-of-CB1.2-and-Joomla1.5... then i have no recomendation yet...
(mayb someone is building it right now).
anyway, i haven't really tested this sort of case... anyone?
just tryn 2help, hope it's useful.