I thank best way to translate wordpress in various languages is to develop a wordpress plugin, that should permit inline translation to strings at their own display on wordpress front end and back-end.
Such a plugin should have ability to synchronize with GLOTPRESS so that any translation of .PO files be stored there automatically as well as be exported to live website through plugin interface.
this would reduce duplicate effort by users, and would result in better translation available via crowdsourcing.
any file that have 0% translation available may be offered machine translation in the beginning