Bug 13245: Prevent non-english TBBs from upgrading to english version.
Update changelog for 4.0a3 (and fix 3.6.6 changelog for history).
Add the update responses script

Add the update responses script in directory tools/update-responses.

This adds the content of commit 2c3625507a5c12b4c15b6681a8b694114a0cfb7b
from https://github.com/boklm/tb-update-response.