The brand layer version ini-file (program/version.ini resp. program/versionrc)
contains information about the locales supported by the given product in the
three keys

  AllLanguages=en-US
  UpdateID=OpenOffice.org_3_en-US
  UpdateUserAgent=<PRODUCT> (${buildid}; ${_OS}; ${_ARCH};
BundledLanguages=${AllLanguages})

(example values from DEV300m32 unxlngi6.pro en-US OOo; see
trunk/scp2/source/ooo/common_brand.scp@261768 and
trunk/solenv/bin/modules/installer/scriptitems.pm@261522).

Given that ideally additional locale support can be added to an installed
product by adding appropriate (system-native: rpm, etc.) packages (that would
not modify values in the product's version ini-file), the way information about
supported locales is determined to be communicated in update requests (if it is
necessary there at all) should be thought over.

In any event, the key AllLanguages appears to be only used in the defintion of
UpdateUserAgent (and nowhere else in the DEV300m32 OOo code base), so that key
can probably be removed completely from the version ini-file.