This would be incredibly helpful. It would be nice if there was a copy on the ST site, so we could review what was missing, and more users could help with the translations.
I really believe that since ST has chosen to move upscale with their recent pricing policies, they should take more ownership for the languages in their products. Based on their known customer base, they should provide 6 or 8 of the most popular languages as professional translations -- it's not that expensive to have it done. Then, by providing a solid tool liek this, the less popular languages could easily be kept current by interested users.
Good suggestion!