Code review comment for lp:~openbmsjsc/openobject-addons/addons-extra-trunk-l10n_vn

"2. For language localization, what should be the best practice (...)?"
Ideally you should have the data in English in the data files, and a translation into your language. That will let interested contributors translate it to their own language.
But often, the data for l10n projects is only available in the native language of the project, so it's accepted that you provide that instead of English.
Lionel Sausin.