Thanks for getting back so quickly.
I can see all of those language files, which are as you say sub 350k each. But there’s a directory .svn under locale and within it another pristine which has 123 or so sub directories each named with a two-character code, all of which are valid hex numbers, i.e. about half of the 256 possible. All of these take up about 27MB.
Do you know if that .svn directory and its contents should be there?