Couldn’t find the resolution to this previous thread about TwentyTen theme still being included in 3.5.x.
The theme files still exist under 3.5 branch:
https://core.trac.wordpress.org/browser/branches/3.5/wp-content/themes/twentyten
For consistency with en package, we’d like to exclude TwentyTen from Japanese package. Is there such an option?